iOS中断点下载详解

布局如下:

基本拖拉属性:

[objc] view plaincopy

#import "ViewController.h"
#import "AFNetworking.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *progressLabel;
@property (weak, nonatomic) IBOutlet UIProgressView *progressView;
@property (nonatomic, strong) AFHTTPRequestOperation *operation;
@end
@implementation ViewController

调用:

[objc] view plaincopy

- (void)viewDidLoad
{
[super viewDidLoad];
NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;
NSString *txtPath = [cachePath stringByAppendingPathComponent:@"mvTemp/mv.txt"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:txtPath]) {
self.progressView.progress = [[NSString stringWithContentsOfFile:txtPath encoding:NSUTF8StringEncoding error:nil] floatValue];
self.progressLabel.text = [NSString stringWithFormat:@"%.2f%%", _progressView.progress * 100];
} else {
self.progressView.progress = 0;
self.progressLabel.text = @"0%";
}
NSLog(@"%@", NSHomeDirectory());
}

点击事件:

[objc] view plaincopy

- (IBAction)startOrCancelDownLoad:(UIButton *)sender
{
if ([sender.currentTitle isEqualToString:@"开始下载"]) {
[sender setTitle:@"暂停下载" forState:UIControlStateNormal];
NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES).lastObject;
NSString *filePath = [cachePath stringByAppendingPathComponent:@"mv"];
NSString *tempPath = [cachePath stringByAppendingPathComponent:@"mvTemp"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:filePath]) {
[fileManager createDirectoryAtPath:filePath withIntermediateDirectories:YES attributes:nil error:nil];
}
if (![fileManager fileExistsAtPath:tempPath]) {
[fileManager createDirectoryAtPath:tempPath withIntermediateDirectories:YES attributes:nil error:nil];
}
NSString *mp4TempPath = [tempPath stringByAppendingPathComponent:@"mv.temp"];
NSString *txtTempPath = [tempPath stringByAppendingPathComponent:@"mv.txt"];
NSString *mp4Path = [filePath stringByAppendingPathComponent:@"mv.mp4"];
NSURL *url = [NSURL URLWithString:@"http://video.szzhangchu.com/1442395443772_5176326090.mp4"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
unsigned long long downLoadBytes = 0;
if ([fileManager fileExistsAtPath:mp4TempPath]) {
downLoadBytes = [self fileSizeAtPath:mp4TempPath];
NSString *range = [NSString stringWithFormat:@"bytes=%llu-", downLoadBytes];
NSMutableURLRequest *mutableRequest = [request mutableCopy];
[mutableRequest setValue:range forHTTPHeaderField:@"Range"];
request = mutableRequest;
}
if (![fileManager fileExistsAtPath:mp4Path]) {
self.operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[self.operation setOutputStream:[NSOutputStream outputStreamToFileAtPath:mp4TempPath append:YES]];
__weak typeof(self) weakSelf = self;
[_operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
weakSelf.progressView.progress = (float)(totalBytesRead + downLoadBytes) / (float)(totalBytesExpectedToRead + downLoadBytes);
weakSelf.progressLabel.text = [NSString stringWithFormat:@"%.2f%%", weakSelf.progressView.progress * 100];
NSString *progress = [NSString stringWithFormat:@"%.3f", weakSelf.progressView.progress];
[progress writeToFile:txtTempPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
}];
[_operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
[fileManager moveItemAtPath:mp4TempPath toPath:mp4Path error:nil];
[fileManager removeItemAtPath:txtTempPath error:nil];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
}];
[_operation start];
}
} else {
[sender setTitle:@"开始下载" forState:UIControlStateNormal];
[self.operation cancel];
_operation = nil;
}
}

[objc] view plaincopy

- (unsigned long long)fileSizeAtPath:(NSString *)path
{
unsigned long long fileSize = 0;
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:path]) {
NSError *error = nil;
NSDictionary *dict = [fileManager attributesOfItemAtPath:path error:&error];
if (dict && !error) {
fileSize = [dict fileSize];
}
}
return fileSize;
}

最终效果如下:

用到的第三方数据请求:AFNetworking,大家应该都有,这里不做介绍

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原文地址：http://blog.csdn.net/qq_31810357/article/details/49882769

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