新建工具类继承于NSObject
.h中
//正在下载
typedef void(^downLoading)(long long bytesWritten,float progress);
//下载完成之后要走的方法
typedef void(^comlated)(NSString *filepath);
@interface downLoad : NSObject
//重写初始化方法
- (instancetype)initWithUrl:(NSString *)url;
//开始下载
- (void)startDownload;
//暂停下载
- (void)stopDownload;
// 下载/下载完成
- (void)downloading:(downLoading)downloading didFinashed:(comlated)didFinashed;
.m 中
@interface downLoad ()<NSURLSessionDownloadDelegate>
@property (nonatomic ,strong)NSURLSession *session;
@property (nonatomic ,strong)NSURLSessionDownloadTask *task;
//正在下载
@property (nonatomic ,copy)downLoading downloading;
//下载完成
@property (nonatomic ,copy)comlated comlated;
@end
@implementation downLoad
- (NSURLSession *)session{
//懒加载
if (!_session) {
_session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:nil];
}
return _session;
}
//自定义初始化方法
- (instancetype)initWithUrl:(NSString *)url{
self = [super init];
if (self) {
//创建一个下载任务
self.task = [self.session downloadTaskWithURL:[NSURL URLWithString:url]];
}
return self;
}
//开始下载
- (void)startDownload{
[self.task resume];
}
//暂停下载
- (void)stopDownload{
[self.task suspend];
}
//正在下载
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite{
if (self.comlated) {
//设置progress的格式 0~1
self.downloading(bytesWritten,totalBytesWritten/(float)totalBytesExpectedToWrite);
}
}
//下载完成之后
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location{
//要存放下载文件的路径
NSString *filepath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject;
//拼接文件的名字，名字是服务器给的
NSString *filename = downloadTask.response.suggestedFilename;
filepath = [filepath stringByAppendingPathComponent:filename];
//文件管理器,将临时文件移动到缓存文件中
[[NSFileManager defaultManager]moveItemAtPath:location.path toPath:filepath error:nil];
if (self.comlated) {
self.comlated(filepath);
}
}
//下载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
属性、头文件
@interface ViewController ()<MBProgressHUDDelegate>
//设置MBProgressHUD 属性
@property (nonatomic ,strong)MBProgressHUD *hub;
//downLoad 属性
@property (nonatomic ,strong)downLoad *mydownload;
@property (weak, nonatomic) IBOutlet UIView *blueView;
//用来传值
@property (nonatomic )float progresss;
懒加载部分
//懒加载
- (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
//下载
[self download];
点击事件
#开始
- (IBAction)startDownloadAction:(UIButton *)sender {
//开始下载
[self.mydownload startDownload];
//设置任务进行时需要做的事情
self.hub.labelText = @"请稍等";
//设置提示框样,MBProgressHUDModeDeterminate是个枚举值
self.hub.mode = MBProgressHUDModeDeterminate;
//设置任务进行时的动画
[self.hub showAnimated:YES whileExecutingBlock:^{
while (self.progresss < 1.0f) {
self.hub.progress = self.progresss;
usleep(50000);
}
}completionBlock:^{
//任务完成之后需要做的事情
[self.hub removeFromSuperViewOnHide];
self.hub = nil;
self.hub.labelText = @"下载成功";
//文本提示框
self.hub.mode = MBProgressHUDModeCustomView;
[self.hub showAnimated:YES whileExecutingBlock:^{
//设置文本提示框消失的时间（单位为秒）
sleep(2);
} completionBlock:^{
//当文本框消失后把它移除
[self.hub removeFromSuperViewOnHide];
self.hub = nil;
}];
}];
}
//这里面是下载中和下载完要走的方法
- (void)download{
[self.mydownload downloading:^(long long bytesWritten, float progress) {
self.progresss = progress;
NSLog(@"%f",progress);
} didFinashed:^(NSString *filepath) {
NSLog(@"%@",filepath);
}];
}
#暂停
- (IBAction)suspendDownloadAction:(UIButton *)sender {
//暂停下载
[self.mydownload stopDownload];
}
storyboard 中
屏幕快照 2016-06-25 下午11.33.12.png
运行
123.gif
