新建工具類繼承于NSObject
.h中
//正在下載
typedef void(^downLoading)(long long bytesWritten,float progress);
//下載完成之后要走的方法
typedef void(^comlated)(NSString *filepath);
@interface downLoad : NSObject
//重寫初始化方法
- (instancetype)initWithUrl:(NSString *)url;
//開始下載
- (void)startDownload;
//暫停下載
- (void)stopDownload;
// 下載/下載完成
- (void)downloading:(downLoading)downloading didFinashed:(comlated)didFinashed;
.m 中
@interface downLoad ()<NSURLSessionDownloadDelegate>
@property (nonatomic ,strong)NSURLSession *session;
@property (nonatomic ,strong)NSURLSessionDownloadTask *task;
//正在下載
@property (nonatomic ,copy)downLoading downloading;
//下載完成
@property (nonatomic ,copy)comlated comlated;
@end
@implementation downLoad
- (NSURLSession *)session{
//懶加載
if (!_session) {
_session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:nil];
}
return _session;
}
//自定義初始化方法
- (instancetype)initWithUrl:(NSString *)url{
self = [super init];
if (self) {
//創建一個下載任務
self.task = [self.session downloadTaskWithURL:[NSURL URLWithString:url]];
}
return self;
}
//開始下載
- (void)startDownload{
[self.task resume];
}
//暫停下載
- (void)stopDownload{
[self.task suspend];
}
//正在下載
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{
if (self.comlated) {
//設置progress的格式 0~1
self.downloading(bytesWritten,totalBytesWritten/(float)totalBytesExpectedToWrite);
}
}
//下載完成之后
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location{
//要存放下載文件的路徑
NSString *filepath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject;
//拼接文件的名字，名字是服務器給的
NSString *filename = downloadTask.response.suggestedFilename;
filepath = [filepath stringByAppendingPathComponent:filename];
//文件管理器,將臨時文件移動到緩存文件中
[[NSFileManager defaultManager]moveItemAtPath:location.path toPath:filepath error:nil];
if (self.comlated) {
self.comlated(filepath);
}
}
//下載完成之后要走的方法
- (void)downloading:(downLoading)downloading didFinashed:(comlated)didFinashed{
self.downloading = downloading;
self.comlated = didFinashed;
}
viewController.m中
屬性、頭文件
@interface ViewController ()<MBProgressHUDDelegate>
//設置MBProgressHUD 屬性
@property (nonatomic ,strong)MBProgressHUD *hub;
//downLoad 屬性
@property (nonatomic ,strong)downLoad *mydownload;
@property (weak, nonatomic) IBOutlet UIView *blueView;
//用來傳值
@property (nonatomic )float progresss;
懶加載部分
//懶加載
- (MBProgressHUD *)hub {
if (!_hub) {
_hub = [[MBProgressHUD alloc]initWithView:self.view];
[self.blueView addSubview:_hub];
}
return _hub;
}
- (downLoad *)mydownload{
if (!_mydownload) {
_mydownload = [[downLoad alloc]initWithUrl:kdownloadUrl];
}
return _mydownload;
}
viewDidLoad 中
//下載
[self download];
點擊事件
#開始
- (IBAction)startDownloadAction:(UIButton *)sender {
//開始下載
[self.mydownload startDownload];
//設置任務進行時需要做的事情
self.hub.labelText = @"請稍等";
//設置提示框樣,MBProgressHUDModeDeterminate是個枚舉值
self.hub.mode = MBProgressHUDModeDeterminate;
//設置任務進行時的動畫
[self.hub showAnimated:YES whileExecutingBlock:^{
while (self.progresss < 1.0f) {
self.hub.progress = self.progresss;
usleep(50000);
}
}completionBlock:^{
//任務完成之后需要做的事情
[self.hub removeFromSuperViewOnHide];
self.hub = nil;
self.hub.labelText = @"下載成功";
//文本提示框
self.hub.mode = MBProgressHUDModeCustomView;
[self.hub showAnimated:YES whileExecutingBlock:^{
//設置文本提示框消失的時間（單位為秒）
sleep(2);
} completionBlock:^{
//當文本框消失后把它移除
[self.hub removeFromSuperViewOnHide];
self.hub = nil;
}];
}];
}
//這里面是下載中和下載完要走的方法
- (void)download{
[self.mydownload downloading:^(long long bytesWritten, float progress) {
self.progresss = progress;
NSLog(@"%f",progress);
} didFinashed:^(NSString *filepath) {
NSLog(@"%@",filepath);
}];
}
#暫停
- (IBAction)suspendDownloadAction:(UIButton *)sender {
//暫停下載
[self.mydownload stopDownload];
}
storyboard 中
屏幕快照 2016-06-25 下午11.33.12.png
運行
123.gif
