iOS-Skill技巧
2024-04-24 21:00:57
本文标题:iOS-Skill技巧
文章作者:Yi’mouleng
发布时间:2014年04月23日 - 00时00分
最后更新:2016年01月26日 - 16时17分
原始链接:http://yimouleng.com/2014/04/23/ios-skill/
许可协议: “署名-非商用-相同方式共享 3.0” 转载请保留原文链接及作者。
iOS开发过程中，各种小问题，小技巧，代码片段， 在这里收集，写下，方便查阅，有时间会将其分类，并添加导航和标签。
PS:查找东西，现在只能用com+f,搜索关键字查找。。。
本文应该不在更新，或者说不在blog中更新了，有点麻烦，我会在Github中继续更新，链接地址
返回输入键盘
<UITextFieldDelegate>- (BOOL)textFieldShouldReturn:(UITextField *)textField {[textField resignFirstResponder];return YES;
}CGRect
CGRectFromString(<#NSString *string#>)//有字符串恢复出矩形
CGRectInset(<#CGRect rect#>, <#CGFloat dx#>, <#CGFloat dy#>)//创建较小或者较大的矩形
CGRectIntersectsRect(<#CGRect rect1#>, <#CGRect rect2#>)//判断两巨星是否交叉，是否重叠
CGRectZero//高度和宽度为零的，位于（0，0）的矩形常量隐藏状态栏
[UIApplication sharedApplication] setStatusBarHidden:<#(BOOL)#> withAnimation:<#(UIStatusBarAnimation)#>//隐藏状态栏
自动适应父视图大小
self.view.autoresizesSubviews = YES;self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;UITableView的一些方法
这里我自己做了个测试，缩进级别设置为行号，row越大，缩进越多
<UITableViewDelegate>- (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath {NSInteger row = indexPath.row;return row;
}把plist文件中的数据赋给数组
NSString *path = [[NSBundle mainBundle] pathForResource:@"States" ofType:@"plist"];
NSArray *array = [NSArray arrayWithContentsOfFile:path];获取触摸的点
- (CGPoint)locationInView:(UIView *)view;
- (CGPoint)previousLocationInView:(UIView *)view;获取触摸的属性
@property(nonatomic,readonly) NSTimeInterval timestamp;
@property(nonatomic,readonly) UITouchPhase phase;
@property(nonatomic,readonly) NSUInteger tapCount;
从plist中获取数据赋给字典
NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"book" ofType:@"plist"];
NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfFile:plistPath];NSUserDefaults注意事项
设置完了以后如果存储的东西比较重要的话，一定要同步一下
[[NSUserDefaults standardUserDefaults] synchronize];获取Documents目录
NSString *documentsDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];获取tmp目录
NSString *tmpPath = NSTemporaryDirectory();利用Safari打开一个链接
NSURL *url = [NSURL URLWithString:@"http://baidu.com"];
[[UIApplication sharedApplication] openURL:url];利用UIWebView显示pdf文件，网页等等
<UIWebViewDelegate>UIWebView *webView = [[UIWebView alloc]initWithFrame:self.view.bounds];
webView.delegate = self;
webView.scalesPageToFit = YES;
webView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[webView setAllowsInlineMediaPlayback:YES];
[self.view addSubview:webView];NSString *pdfPath = [[NSBundle mainBundle] pathForResource:@"book" ofType:@"pdf"];
NSURL *url = [NSURL fileURLWithPath:pdfPath];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:(NSURLRequestUseProtocolCachePolicy) timeoutInterval:5];
[webView loadRequest:request];UIWebView和html的简单交互
myWebView = [[UIWebView alloc]initWithFrame:self.view.bounds];
[myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];
NSError *error;
NSString *errorString = [NSString stringWithFormat:@"<html><center><font size=+5 color='red'>AnError Occurred;<br>%@</font></center></html>",error];
[myWebView loadHTMLString:errorString baseURL:nil];//页面跳转了以后，停止载入
-(void)viewWillDisappear:(BOOL)animated {if (myWebView.isLoading) {[myWebView stopLoading];}myWebView.delegate = nil;[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}汉字转码
NSString *oriString = @"\u67aa\u738b";
NSString *escapedString = [oriString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];处理键盘通知
先注册通知，然后实现具体当键盘弹出来要做什么，键盘收起来要做什么
- (void)registerForKeyboardNotifications {keyboardShown = NO;//标记当前键盘是没有显示的[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardWillShowNotification object:nil];[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWasHidden:) name:UIKeyboardDidHideNotification object:nil];
}
//键盘显示要做什么
- (void)keyboardWasShown:(NSNotification *)notification {if (keyboardShown) {return;}NSDictionary *info = [notification userInfo];NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey];CGSize keyboardSize = [aValue CGRectValue].size;CGRect viewFrame = scrollView.frame;viewFrame.size.height = keyboardSize.height;CGRect textFieldRect = activeField.frame;[scrollView scrollRectToVisible:textFieldRect animated:YES];keyboardShown = YES;
}- (void)keyboardWasHidden:(NSNotification *)notification {NSDictionary *info = [notification userInfo];NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey];CGSize keyboardSize = [aValue CGRectValue].size;CGRect viewFrame = scrollView.frame;viewFrame.size.height += keyboardSize.height;scrollView.frame = viewFrame;keyboardShown = NO;
}点击键盘的next按钮，在不同的textField之间换行
- (BOOL)textFieldShouldReturn:(UITextField *)textField {if ([textField returnKeyType] != UIReturnKeyDone) {NSInteger nextTag = [textField tag] + 1;UIView *nextTextField = [self.tableView viewWithTag:nextTag];[nextTextField becomeFirstResponder];}else {[textField resignFirstResponder];}return YES;
}设置日期格式
dateFormatter = [[NSDateFormatter alloc]init];
dateFormatter.locale = [NSLocale currentLocale];
dateFormatter.calendar = [NSCalendar autoupdatingCurrentCalendar];
dateFormatter.timeZone = [NSTimeZone defaultTimeZone];
dateFormatter.dateStyle = NSDateFormatterShortStyle;
NSLog(@"%@",[dateFormatter stringFromDate:[NSDate date]]);加载大量图片的时候，可以使用
NSString *imagePath = [[NSBundle mainBundle] pathForResource:@"icon" ofType:@"png"];
UIImage *myImage = [UIImage imageWithContentsOfFile:imagePath];有时候在iPhone游戏中，既要播放背景音乐，同时又要播放比如枪的开火音效。
NSString *musicFilePath = [[NSBundle mainBundle] pathForResource:@"xx" ofType:@"wav"];
NSURL *musicURL = [NSURL fileURLWithPath:musicFilePath];
AVAudioPlayer *musicPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:musicURL error:nil];
[musicPlayer prepareToPlay];
musicPlayer.volume = 1;
musicPlayer.numberOfLoops = -1;//-1表示一直循环从通讯录中读取电话号码，去掉数字之间的-
NSString *originalString = @"(123)123123abc";
NSMutableString *strippedString = [NSMutableString stringWithCapacity:originalString.length];
NSScanner *scanner = [NSScanner scannerWithString:originalString];
NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];while ([scanner isAtEnd] == NO) {NSString *buffer;if ([scanner scanCharactersFromSet:numbers intoString:&buffer]) {[strippedString appendString:buffer];}else {scanner.scanLocation = [scanner scanLocation] + 1;}}NSLog(@"%@",strippedString);字符串是否为空
- (BOOL) isBlankString:(NSString *)string {if (string == nil || string == NULL) {return YES;}if ([string isKindOfClass:[NSNull class]]) {return YES;}if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0) {return YES;}return NO;
}正则判断：字符串只包含字母和数字
NSString *myString = @"Letter1234";
NSString *regex = @"[a-z][A-Z][0-9]";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex]; if ([predicate evaluateWithObject:myString]) { //implement
}设置UITableView的滚动条颜色
self.tableView.indicatorStyle = UIScrollViewIndicatorStyleWhite;
网络编程
开发web等网络应用程序的时候，需要确认网络环境，连接情况等信息。如果没有处理它们，是不会通过apple的审查的。
系统自带的网络检查是原生的，AFNetworking也为我们添加了相关检测机制，所以这个直接在介绍AFNetworking的时候详解吧。
使用NSURLConnection下载数据
1. 创建对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];
[NSURLConnection connectionWithRequest:request delegate:self];2. NSURLConnection delegate 委托方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {}- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {}- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {}- (void)connectionDidFinishLoading:(NSURLConnection *)connection {}3. 实现委托方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {self.receiveData.length = 0;//先清空数据
}- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {[self.receiveData appendData:data];
}- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {//错误处理
}- (void)connectionDidFinishLoading:(NSURLConnection *)connection {[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;NSString *returnString = [[NSString alloc]initWithData:self.receiveData encoding:NSUTF8StringEncoding];firstTimeDownloaded = YES;
}隐藏状态栏
[UIApplication sharedApplication].statusBarHidden = YES;读取一般性文件
- (void)readFromTXT {NSString *tmp;NSArray *lines;//将文件转化为一行一行的lines = [[NSString stringWithContentsOfFile:@"testFileReadLines.txt"] componentsSeparatedByString:@"\n"];NSEnumerator *nse = [lines objectEnumerator];//读取<>里的内容while (tmp == [nse nextObject]) {NSString *stringBetweenBrackets = nil;NSScanner *scanner = [NSScanner scannerWithString:tmp];[scanner scanUpToString:@"<" intoString:nil];[scanner scanString:@"<" intoString:nil];[scanner scanUpToString:@">" intoString:&stringBetweenBrackets];NSLog(@"%@",[stringBetweenBrackets description]);}
}隐藏UINavigationBar
[self.navigationController setNavigationBarHidden:YES animated:YES];
调用电话，短信，邮件
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"mailto:apple@mac.com?Subject=hello"]];
sms://调用短信
tel://调用电话
itms://打开MobileStore.app获取版本信息
UIDevice *myDevice = [UIDevice currentDevice];
NSString *systemVersion = myDevice.systemVersion;UIWebView的使用
<UIWebViewDelegate>webView.delegate = self;(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {NSURL *url = request.URL;NSString *urlStirng = url.absoluteString;NSLog(@"%@",urlStirng);return YES;
}UIButton的title和image不能同时显示
UINavigationItem也是
不要再语言包里面设置空格
NSNotificationCenter带参数发送
MPMoviePlayerController *theMovie = [[MPMoviePlayerController alloc]initWithContentURL:[NSURL fileURLWithPath:moviePath]];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];
[theMovie play];- (void)myMovieFinishedCallback:(NSNotification *)aNotification {MPMoviePlayerController *theMovie = [aNotification object];[[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];
}延迟一段时间执行某个函数
[self performSelector:@selector(dismissModal) withObject:self afterDelay:1.0];用NSDateFormatter调整时间格式代码
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]];
UIView设置成圆角的方法
mainView.layer.cornerRadius = 6;
mainView.layer.masksToBounds = YES;
iPhone 更改键盘右下角按键的 type
SearchBar *mySearchBar = [[UISearchBar alloc]init];
mySearchBar.frame = CGRectMake(0, 0, self.view.bounds.size.width, 44);
mySearchBar.placeholder = @"placeholderString";
mySearchBar.delegate = self;
[self.view addSubview:mySearchBar];
UITextField *searchField = [[mySearchBar subviews] lastObject];
searchField.returnKeyType = UIReturnKeyDone;tableView左滑出多个按钮
- (NSArray *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath
{//删除按钮UITableViewRowAction *deleteRowAction = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDefault title:@"删除" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath){[_dataArray removeObjectAtIndex:indexPath.row];[tableView deleteRowsAtIndexPaths:@[indexPath]withRowAnimation:UITableViewRowAnimationAutomatic];}];//置顶按钮UITableViewRowAction *toTopRowAction = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDefault title:@"置顶" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath){NSLog(@"置顶");}];toTopRowAction.backgroundColor = [UIColor orangeColor];//其他按钮UITableViewRowAction *otherRowAction = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDefault title:@"其他" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath){NSLog(@"其他");}];otherRowAction.backgroundColor = [UIColor lightGrayColor];//返回按钮数组return @[deleteRowAction, toTopRowAction, otherRowAction];
}给图片增加模糊效果
//加模糊效果，image是图片，blur是模糊度
+ (UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur {//模糊度,if ((blur < 0.1f) || (blur > 2.0f)) {blur = 0.1f;}//boxSize必须大于0int boxSize = (int)(blur * 100);boxSize -= (boxSize % 2) + 1;NSLog(@"boxSize:%i",boxSize);//图像处理CGImageRef img = image.CGImage;//图像缓存,输入缓存，输出缓存vImage_Buffer inBuffer, outBuffer;vImage_Error error;//像素缓存void *pixelBuffer;//数据源提供者，Defines an opaque type that supplies Quartz with data.CGDataProviderRef inProvider = CGImageGetDataProvider(img);// provider’s data.CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);//宽，高，字节/行，datainBuffer.width = CGImageGetWidth(img);inBuffer.height = CGImageGetHeight(img);inBuffer.rowBytes = CGImageGetBytesPerRow(img);inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);//像数缓存，字节行*图片高pixelBuffer = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));outBuffer.data = pixelBuffer;outBuffer.width = CGImageGetWidth(img);outBuffer.height = CGImageGetHeight(img);outBuffer.rowBytes = CGImageGetBytesPerRow(img);// 第三个中间的缓存区,抗锯齿的效果void *pixelBuffer2 = malloc(CGImageGetBytesPerRow(img) * CGImageGetHeight(img));vImage_Buffer outBuffer2;outBuffer2.data = pixelBuffer2;outBuffer2.width = CGImageGetWidth(img);outBuffer2.height = CGImageGetHeight(img);outBuffer2.rowBytes = CGImageGetBytesPerRow(img);//Convolves a region of interest within an ARGB8888 source image by an implicit M x N kernel that has the effect of a box filter.error = vImageBoxConvolve_ARGB8888(&inBuffer;, &outBuffer2;, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);error = vImageBoxConvolve_ARGB8888(&outBuffer2;, &inBuffer;, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);error = vImageBoxConvolve_ARGB8888(&inBuffer;, &outBuffer;, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);if (error) {NSLog(@"error from convolution %ld", error);}// NSLog(@"字节组成部分：%zu",CGImageGetBitsPerComponent(img));//颜色空间DeviceRGBCGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();//用图片创建上下文,CGImageGetBitsPerComponent(img),7,8CGContextRef ctx = CGBitmapContextCreate(outBuffer.data,outBuffer.width,outBuffer.height,8,outBuffer.rowBytes,colorSpace,CGImageGetBitmapInfo(image.CGImage));//根据上下文，处理过的图片，重新组件CGImageRef imageRef = CGBitmapContextCreateImage (ctx);UIImage *returnImage = [UIImage imageWithCGImage:imageRef];//clean upCGContextRelease(ctx);CGColorSpaceRelease(colorSpace);free(pixelBuffer);free(pixelBuffer2);CFRelease(inBitmapData);CGImageRelease(imageRef);return returnImage;
}网易新闻头部滚动切换
- (void)titleButtonDidClick:(UIButton *)titleButton
{self.mainScrollView.contentOffset = CGPointMake(kScreenWidth * titleButton.tag, 0);[UIView animateWithDuration:0.5 animations:^{if (self.titleScrollView.contentOffset.x >= 0) {self.titleScrollView.contentOffset = CGPointMake(titleButton.x - 150, 0);}// 先改变contentOffset，若偏移则修正if (self.titleScrollView.contentOffset.x <= 0) {self.titleScrollView.contentOffset = CGPointZero;}if (self.titleScrollView.contentOffset.x >= 2 * 900 - kScreenWidth) {self.titleScrollView.contentOffset = CGPointMake(2 * 900 - kScreenWidth, 0);}}];
}七牛上传图片的简单封装
#import "QiNiuTool.h"
#import "JKRAccountTool.h"
#import "JKRAccount.h"
#import "QiniuSDK.h"
#import "QiNiuUpLoadResult.h"
#import <UIKit/UIKit.h>@implementation QiNiuTool+ (void)uploadImages:(NSArray *)images complete:(void (^)(NSDictionary *))complete
{QNUploadManager *qnm = [[QNUploadManager alloc] init];NSDateFormatter *mattter = [[NSDateFormatter alloc]init];[mattter setDateFormat:@"yyyyMMddHHmmss"];NSString *Nowdate = [mattter stringFromDate:[NSDate date]];QiNiuUpLoadResult *result = [[QiNiuUpLoadResult alloc] init];__block int count = 0;for (int i = 0; i < images.count; i++) {UIImage *image = images[i];NSData *uploadData = UIImageJPEGRepresentation(image, 1);//这里对大图片做了压缩，不需要的话下面直接传uploadData就好NSData *cutdownData = nil;if (uploadData.length < 9999) {cutdownData = UIImageJPEGRepresentation(image, 1.0);} else if (uploadData.length < 99999) {cutdownData = UIImageJPEGRepresentation(image, 0.6);} else {cutdownData = UIImageJPEGRepresentation(image, 0.3);}//[JKRAccountTool getAccount].token:token[qnm putData:cutdownData key:[NSString stringWithFormat:@"%@%d", Nowdate, i+1] token:[JKRAccountTool getAccount].token complete:^(QNResponseInfo *info, NSString *key, NSDictionary *resp) {count++;NSString *resultKey = [NSString stringWithFormat:@"%d",i];result.keys[resultKey] = [resp objectForKey:@"key"];if (count == images.count) {complete(result.keys);}} option:nil];}}@end导航条渐隐渐现
[_tableView addObserver: self forKeyPath: @"contentOffset" options: NSKeyValueObservingOptionNew context:nil];- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context{CGFloat offset=_tableView.contentOffset.y;NSLog(@"offset:%f",offset);//越来越大 想要实现效果：一开始全显示，后来颜色变浅CGFloat delta=1-offset/100.f;delta=MIN(1,delta);NSLog(@"%f",delta);self.navigationController.navigationBar.alpha=MIN(1,delta);}导航条渐隐渐现
用法：UIImage *yourImage= [self imageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)];
//压缩图片
- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize
{
// Create a graphics image context
UIGraphicsBeginImageContext(newSize);
// Tell the old image to draw in this newcontext, with the desired
// new size
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
// Get the new image from the context
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
// End the context
UIGraphicsEndImageContext();
// Return the new image.
return newImage;
}图片裁剪，类似新浪微博小图显示效果
CGSize asize = CGSizeMake(300, 300);UIImage *newimage;UIImage *image = [UIImage imageNamed:@""];if (nil == image) {newimage = nil;}else{CGSize oldsize = image.size;CGRect rect;if (asize.width/asize.height > oldsize.width/oldsize.height) {rect.size.width = asize.width;rect.size.height = asize.width*oldsize.height/oldsize.width;rect.origin.x = 0;rect.origin.y = (asize.height - rect.size.height)/2;}else{rect.size.width = asize.height*oldsize.width/oldsize.height;rect.size.height = asize.height;rect.origin.x = (asize.width - rect.size.width)/2;rect.origin.y = 0;}UIGraphicsBeginImageContext(asize);CGContextRef context = UIGraphicsGetCurrentContext();CGContextClipToRect(context, CGRectMake(0, 0, asize.width, asize.height));CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);UIRectFill(CGRectMake(0, 0, asize.width, asize.height));//clear background[image drawInRect:rect];newimage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();}UIImageView * imgView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 10, 100, 100)];imgView.image = newimage;[self.view addSubview:imgView];把时间戳转换为时间
+ (NSDate *)dateWithTimeIntervalInMilliSecondSince1970:(double)timeIntervalInMilliSecond {NSDate *ret = nil;double timeInterval = timeIntervalInMilliSecond;// judge if the argument is in secconds(for former data structure).if(timeIntervalInMilliSecond > 140000000000) {timeInterval = timeIntervalInMilliSecond / 1000;}ret = [NSDate dateWithTimeIntervalSince1970:timeInterval];return ret;
}自定义cell中获取不到cell实际大小的办法
-(void)drawRect:(CGRect)rect {// 重写此方法，并在此方法中获取CGFloat width = self.frame.size.width;
}长按图标抖动
-(void)longPress:(UILongPressGestureRecognizer*)longPress
{if (longPress.state==UIGestureRecognizerStateBegan) {CAKeyframeAnimation* anim=[CAKeyframeAnimation animation];anim.keyPath=@"transform.rotation";anim.values=@[@(angelToRandian(-7)),@(angelToRandian(7)),@(angelToRandian(-7))];anim.repeatCount=MAXFLOAT;anim.duration=0.2;[self.imageView.layer addAnimation:anim forKey:nil];self.btn.hidden=NO;}
}阿拉伯数字转化为汉语数字
+(NSString *)translation:(NSString *)arebic{ NSString *str = arebic;NSArray *arabic_numerals = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"0"];NSArray *chinese_numerals = @[@"一",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"零"];NSArray *digits = @[@"个",@"十",@"百",@"千",@"万",@"十",@"百",@"千",@"亿",@"十",@"百",@"千",@"兆"];NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:chinese_numerals forKeys:arabic_numerals];NSMutableArray *sums = [NSMutableArray array];for (int i = 0; i < str.length; i ++) {NSString *substr = [str substringWithRange:NSMakeRange(i, 1)];NSString *a = [dictionary objectForKey:substr];NSString *b = digits[str.length -i-1];NSString *sum = [a stringByAppendingString:b];if ([a isEqualToString:chinese_numerals[9]]){if([b isEqualToString:digits[4]] || [b isEqualToString:digits[8]]){sum = b;if ([[sums lastObject] isEqualToString:chinese_numerals[9]]){[sums removeLastObject];}}else{sum = chinese_numerals[9];}if ([[sums lastObject] isEqualToString:sum]){continue;}}[sums addObject:sum];}NSString *sumStr = [sums componentsJoinedByString:@""];NSString *chinese = [sumStr substringToIndex:sumStr.length-1];NSLog(@"%@",str);NSLog(@"%@",chinese);return chinese;
}两种方法删除NSUserDefaults所有记录
//方法一
NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
[[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];//方法二
- (void)resetDefaults {NSUserDefaults * defs = [NSUserDefaults standardUserDefaults];NSDictionary * dict = [defs dictionaryRepresentation];for (id key in dict) {[defs removeObjectForKey:key];}[defs synchronize];
}截屏 全图
- (UIImage *)imageFromView: (UIView *) theView
{UIGraphicsBeginImageContext(theView.frame.size);CGContextRef context = UIGraphicsGetCurrentContext();[theView.layer renderInContext:context];UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return theImage;
}判断是否用户开启了定位服务
if ([CLLocationManager locationServicesEnabled] && ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorized || [CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined)) { //定位功能可用，开始定位 _locationManger = [[CLLocationManager alloc] init]; locationManger.delegate = self; [locationManger startUpdatingLocation]; } else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied){ NSlog("定位功能不可用，提示用户或忽略"); }图片旋转
UIImage * image = [UIImage imageNamed:@"iphone.png"];
NSData * tempData;
if (UIImagePNGRepresentation(image)) {tempData = UIImagePNGRepresentation(image);NSLog(@"%@",tempData);
}
else{tempData = UIImageJPEGRepresentation(image, 1);
}
CIImage * iImg = [CIImage imageWithData:tempData];
UIImage * tImg = [UIImage imageWithCIImage:iImg scale:1 orientation:UIImageOrientationRight];
NSLog(@"%@",UIImagePNGRepresentation(tImg));
UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 200, 200, 80)];
imageView.image = tImg;
[self.view addSubview:imageView];去除UIImageView锯齿
imageView.layer.shouldRasterize = YES;
判断两个日期之间的间隔
NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyyMMddHHmmss"];
NSDate* toDate = [dateFormatter dateFromString:@"19700608142033"];
NSDate* startDate = [ [ NSDate alloc] init ];
NSCalendar* chineseClendar = [ [ NSCalendar alloc ] initWithCalendarIdentifier:NSGregorianCalendar ];
NSUInteger unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit;NSDateComponents *cps = [ chineseClendar components:unitFlags fromDate:startDate toDate:toDate options:0];NSInteger diffYear = [cps year];
NSInteger diffMon = [cps month];
NSInteger diffDay = [cps day];
NSInteger diffHour = [cps hour];
NSInteger diffMin = [cps minute];
NSInteger diffSec = [cps second];NSLog(@" From Now to %@, diff: Years: %d Months: %d, Days; %d, Hours: %d, Mins:%d, sec:%d", [toDate description], diffYear, diffMon, diffDay, diffHour, diffMin,diffSec );类似微信发送视频的流程
//获取视频的本地url或者path，对视频进行获取第一帧图片，然后初始化消息的Model，设置封面NSString *mediaType = [editingInfo objectForKey: UIImagePickerControllerMediaType];NSString *videoPath;NSURL *videoUrl;if (CFStringCompare ((__bridge CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo) {videoUrl = (NSURL*)[editingInfo objectForKey:UIImagePickerControllerMediaURL];videoPath = [videoUrl path];AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoUrl options:nil];NSParameterAssert(asset);AVAssetImageGenerator *assetImageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];assetImageGenerator.appliesPreferredTrackTransform = YES;assetImageGenerator.apertureMode = AVAssetImageGeneratorApertureModeEncodedPixels;CGImageRef thumbnailImageRef = NULL;CFTimeInterval thumbnailImageTime = 0;NSError *thumbnailImageGenerationError = nil;thumbnailImageRef = [assetImageGenerator copyCGImageAtTime:CMTimeMake(thumbnailImageTime, 60) actualTime:NULL error:&thumbnailImageGenerationError;];if (!thumbnailImageRef)NSLog(@"thumbnailImageGenerationError %@", thumbnailImageGenerationError);UIImage *thumbnailImage = thumbnailImageRef ? [[UIImage alloc] initWithCGImage:thumbnailImageRef] : nil;XHMessage *videoMessage = [[XHMessage alloc] initWithVideoConverPhoto:thumbnailImage videoPath:videoPath videoUrl:nil sender:@"Jack" timestamp:[NSDate date]];[weakSelf addMessage:videoMessage];}刷新某行cell的方法
//有时候只需要刷新某行的cell的数据，完全没必要调用[tableView reloadData]刷新整个列表的数据，调用以下方法即可。NSIndexPath *indexPath_1=[NSIndexPath indexPathForRow:1 inSection:0];NSArray *indexArray=[NSArray arrayWithObject:indexPath_1];[myTableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationAutomatic];
由身份证号码返回性别
-(NSString *)sexStrFromIdentityCard:(NSString *)numberStr{NSString *result = nil;BOOL isAllNumber = YES;if([numberStr length]<17)return result;//**截取第17为性别识别符NSString *fontNumer = [numberStr substringWithRange:NSMakeRange(16, 1)];//**检测是否是数字;const char *str = [fontNumer UTF8String];const char *p = str;while (*p!='\0') {if(!(*p>='0'&&*p<='9'))isAllNumber = NO;p++;}if(!isAllNumber)return result;int sexNumber = [fontNumer integerValue];if(sexNumber%2==1)result = @"男";///result = @"M";else if (sexNumber%2==0)result = @"女";//result = @"F";return result;}数组随机重新排列
+ (NSArray *)getRandomWithPosition:(NSInteger)position positionContent:(id)positionContent array:(NSArray *)baseArray {NSMutableArray *resultArray = [NSMutableArray arrayWithCapacity:baseArray.count];NSMutableArray *tempBaseArray = [NSMutableArray arrayWithArray:baseArray];while ([tempBaseArray count]) {NSInteger range = [tempBaseArray count];id string = [tempBaseArray objectAtIndex:arc4random()%range];[resultArray addObject:string];[tempBaseArray removeObject:string];}NSUInteger index = [resultArray indexOfObject:positionContent];[resultArray exchangeObjectAtIndex:index withObjectAtIndex:position - 1];return resultArray;
}利用陀螺仪实现更真实的微信摇一摇动画
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{ //想摇你的手机嘛？就写在这，然后，然后，没有然后了application.applicationSupportsShakeToEdit=YES;
}-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {if(motion==UIEventSubtypeMotionShake) {// 真实一点的摇动动画[self addAnimations];// 播放声音AudioServicesPlaySystemSound (soundID); }
}- (void)addAnimations {CABasicAnimation *translation = [CABasicAnimation animationWithKeyPath:@"transform"];translation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];translation.toValue=[NSValue valueWithCATransform3D:CATransform3DMakeRotation(-M_PI_4, 0, 0, 100)];translation.duration = 0.2;translation.repeatCount = 2;translation.autoreverses = YES;[shake.layer addAnimation:translation forKey:@"translation"];
}GIF图片解析
+ (NSMutableArray *)praseGIFDataToImageArray:(NSData *)data;{NSMutableArray *frames = [[NSMutableArray alloc] init];CGImageSourceRef src = CGImageSourceCreateWithData((CFDataRef)data, NULL);CGFloat animationTime = 0.f;if (src) {size_t l = CGImageSourceGetCount(src);frames = [NSMutableArray arrayWithCapacity:l];for (size_t i = 0; i < l; i++) {CGImageRef img = CGImageSourceCreateImageAtIndex(src, i, NULL);NSDictionary *properties = (NSDictionary *)CGImageSourceCopyPropertiesAtIndex(src, i, NULL);NSDictionary *frameProperties = [properties objectForKey:(NSString *)kCGImagePropertyGIFDictionary];NSNumber *delayTime = [frameProperties objectForKey:(NSString *)kCGImagePropertyGIFUnclampedDelayTime];animationTime += [delayTime floatValue];if (img) {[frames addObject:[UIImage imageWithCGImage:img]];CGImageRelease(img);}}CFRelease(src);}return frames;
}在后台播放音乐
//1. 在Info.plist中，添加"Required background modes"键，其值设置是“App plays audio"
//2. 在播放器播放音乐的代码所在处，添加如下两段代码（当然，前提是已经添加了AVFoundation框架）//添加后台播放代码：
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setActive:YES error:nil];
[session setCategory:AVAudioSessionCategoryPlayback error:nil]; //以及设置app支持接受远程控制事件代码。设置app支持接受远程控制事件，
//其实就是在dock中可以显示应用程序图标，同时点击该图片时，打开app。
//或者锁屏时，双击home键，屏幕上方出现应用程序播放控制按钮。
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; //用下列代码播放音乐，测试后台播放
// 创建播放器
AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[url release];
[player prepareToPlay];
[player setVolume:1];
player.numberOfLoops = -1; //设置音乐播放次数 -1为一直循环
[player play]; //播放本文标题:iOS-Skill技巧
文章作者:Yi’mouleng
发布时间:2014年04月23日 - 00时00分
最后更新:2016年01月26日 - 16时17分
原始链接:http://yimouleng.com/2014/04/23/ios-skill/
许可协议: “署名-非商用-相同方式共享 3.0” 转载请保留原文链接及作者。
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