#import <UIKit/UIKit.h>@interface AppDelegate : UIResponder <UIApplicationDelegate>@property (retain, nonatomic) UIWindow *window;@end

#import "AppDelegate.h"
#import "RootViewController.h"@interface AppDelegate ()@end@implementation AppDelegate
- (void)dealloc
{self.window = nil;[super dealloc];
}- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];// Override point for customization after application launch.RootViewController *rootVC = [RootViewController alloc];UINavigationController *navigationVC = [[UINavigationController alloc] initWithRootViewController:rootVC];self.window.rootViewController = navigationVC;[rootVC release];[navigationVC release];self.window.backgroundColor = [UIColor whiteColor];[self.window makeKeyAndVisible];return YES;
}@end

#import <UIKit/UIKit.h>@interface RootViewController : UIViewController@end

#import "RootViewController.h"@interface RootViewController ()<UINavigationControllerDelegate , UIImagePickerControllerDelegate> // 查看API文档知道,需要遵循这两个代理// 创建属性,为了让每个对象都能访问到
@property (nonatomic , retain)UIImageView *headImage;@end@implementation RootViewController// 重写dealloc
- (void)dealloc
{self.headImage = nil;[super dealloc];
}- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.// 调用创建界面的对象
    [self showHeadImage];// 调用创建手势的对象
    [self tapGesture];
}#pragma mark - 创建界面
- (void)showHeadImage {self.headImage = [[UIImageView alloc] initWithFrame:CGRectMake(120, 50, 80, 80)];_headImage.backgroundColor = [UIColor redColor]; // 验证,查看位置// 创建圆角_headImage.layer.cornerRadius = 40;// 切除多余的部分,如果切除,那么传进来的图片显示方式是正方形_headImage.clipsToBounds = YES;// 打开图片用户交互,不然点击图片将会没有反应_headImage.userInteractionEnabled = YES;[self.view addSubview:_headImage];[_headImage release];}#pragma mark - 创建轻拍手势
- (void)tapGesture {UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];// 将手势添加到_headImage视图上面
    [self.headImage addGestureRecognizer:tap];[tap release];
}#pragma mark - 关联轻拍手势事件
- (void)handleTap:(UITapGestureRecognizer *)sender {// 创建警示视图控制器UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"请选择图片来源" preferredStyle:(UIAlertControllerStyleActionSheet)];// 给警示图视图控制器添加控件UIAlertAction *camera = [UIAlertAction actionWithTitle:@"相机" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {// 调用调用摄像头的方法
        [self callLocalCamera];}];UIAlertAction *photo = [UIAlertAction actionWithTitle:@"相册" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {// 调用调用本地相册的方法
        [self callLocalPhotoAlbum];}];UIAlertAction *cancel = [UIAlertAction actionWithTitle:@"取消" style:(UIAlertActionStyleCancel) handler:^(UIAlertAction *action) {}];// 将控件添加到警示视图控制器上面
    [alertController addAction:camera];[alertController addAction:photo];[alertController addAction:cancel];// 模态出警示视图控制器
    [self presentViewController:alertController animated:YES completion:nil];// 下面使用push的方式展示alertController: 当前页面将会消失进入下一个页面,并且上面没有按钮控件
//    [self.navigationController pushViewController:alertController animated:YES];

}#pragma mark - 调用本地相机
- (void)callLocalCamera {// 判断摄像头是否可用// UIImagePickerController相机选择控制器// isCameraDeviceAvailable:(UIImagePickerControllerCameraDeviceRear):如果后置摄像头可用返回YES,为假返回NO;(检测摄像头设备是否可用)BOOL isAvailabel = [UIImagePickerController isCameraDeviceAvailable:(UIImagePickerControllerCameraDeviceRear)];if (!isAvailabel) { // 如果相机设备不可用,则isAvailbel为空,非就为真
        NSLog(@"没有找到摄像头");return; // 结束调用摄像头
    }// 摄像头可用// 创建图像选择控制器UIImagePickerController *picker = [[UIImagePickerController alloc] init];// 设置图片的来源/*UIImagePickerControllerSourceTypePhotoLibrary, // 显示所有的图片来源UIImagePickerControllerSourceTypeCamera, // 显示摄像头中拍摄的照片UIImagePickerControllerSourceTypeSavedPhotosAlbum // 显示相册中的图片*/picker.sourceType = UIImagePickerControllerSourceTypeCamera;// 允不允许用户对图片进行编辑picker.allowsEditing = YES;// 设置代理,执行代理方法picker.delegate = self;// 模态出视图控制器
    [self presentViewController:picker animated:YES completion:nil];[picker release];}#pragma mark - 调用当地相册
- (void)callLocalPhotoAlbum {// 创建图像选择控制器UIImagePickerController *picker = [[UIImagePickerController alloc] init];// 选择图片来源picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;// 图片是否可编辑picker.allowsEditing = YES;// 设置代理,执行代理方法picker.delegate = self;// 模态出视图控制器
    [self presentViewController:picker animated:YES completion:nil];// 释放
    [picker release];
}#pragma mark - 执行代理方法,将编辑好的图片存放到_headImage上面
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {//
    self.headImage.image = [info objectForKey:UIImagePickerControllerEditedImage];// 模态出当前视图
    [self dismissViewControllerAnimated:YES completion:nil];
}#pragma mark - 内存警告
- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
    }@end