圖片上傳過程中進度條的使用

別處的文章，非本人自寫，學習使用

MBProgressHUD* _hud;

_hud= [[MBProgressHUDalloc]initWithView:self.view];

_hud.labelText=@"正在上傳";

_hud.mode=MBProgressHUDModeAnnularDeterminate;

[self.viewaddSubview:_hud];

3.0之后 ?有些許變化?http://www.lxweimin.com/p/047463a7ce9b

progress部分反映了進度情況

上傳圖片是將數據流壓縮了讓后上傳 ，也可不壓縮

AFHTTPSessionManager* manager= [AFHTTPSessionManagermanager];

manager.responseSerializer.acceptableContentTypes= [NSSetsetWithObject:@"text/html"];

manager.responseSerializer= [AFHTTPResponseSerializerserializer]；

[_hudshow:YES];

[managerPOST:@"Url 字符串"parameters:DictionaryconstructingBodyWithBlock:^(id_NonnullformData) {

NSData* imgData =UIImageJPEGRepresentation(_imgV.image,0.1);//0.1是把圖片壓縮

[formDataappendPartWithFileData:imgDataname:@"PHPhoto"fileName:@"phPhoto.jpg"mimeType:@"image/jpg/png/jpeg"];

}progress:^(NSProgress*_NonnulluploadProgress) {//進度 NSProgress 配合KVC來使用 反應進度情況

[uploadProgressaddObserver:selfforKeyPath:@"fractionCompleted"options:NSKeyValueObservingOptionNewcontext:nil];

}success:^(NSURLSessionDataTask*_Nonnulltask,id_NullableresponseObject) {

[_hudhide:YES];

idroot = [NSJSONSerializationJSONObjectWithData:responseObjectoptions:NSJSONReadingAllowFragmentserror:nil];

NSLog(@"%@",root);

[selfperformSelectorOnMainThread:@selector(backToMain:)withObject:rootwaitUntilDone:YES];

}failure:^(NSURLSessionDataTask*_Nullabletask,NSError*_Nonnullerror) {

[_hudhide:YES];

[selfperformSelectorOnMainThread:@selector(backToMain)withObject:nilwaitUntilDone:YES];

}];

#pragma mark -

#pragma mark上傳進度

- (void)observeValueForKeyPath:(NSString*)keyPath ofObject:(id)object change:(NSDictionary*)change context:(void*)context

{

if([keyPathisEqualToString:@"fractionCompleted"] && [objectisKindOfClass:[NSProgressclass]]) {

NSProgress*progress = (NSProgress*)object;

_hud.progress= progress.fractionCompleted;

}

}

#pragma mark -

這樣就可以反映出 實時的上傳進度了。