怎么在一个线程结束后回到主线程？
我用一个for循环上传三张照片（用的是afnetworking框架）。
上传它就开了一个线程，上传成功后后台返回一个filename，把filename放进一个数组
我想等三张照片全都上传结束后，对获取到的三个filename进行操作
要怎么做？
NSMutableArray *fileNameArr = [[NSMutableArray alloc]init];
for (int i= 0; i<[self.imgArr count]; i++) {
NSData *data = [self.imgArr objectAtIndex:i];
[manager POST:url parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData){
[formData appendPartWithFileData:data name:@"pic" fileName:fileName mimeType:@"image/jpeg"];
}success:^(AFHTTPRequestOperation *operation,id responseObject){
NSLog(@"success:%@",responseObject);
NSString *str = [[responseObject objectForKey:@"data"] objectForKey:@"fileName"];
[fileNameArr addObject:str];
NSString *ids = [[responseObject objectForKey: @"data"] objectForKey:@"ids"];
}
failure:^(AFHTTPRequestOperation *operation,NSError *error){
NSLog(@"%@",error);
}];
}
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dispatch_async(dispatch_get_main_queue(), ^{ //todo something }); 或者[self performSelectorOnMainThread:@selector(xxx:) withObject:self waitUntilDone:NO];2019-07-17 20:01:04赞同 展开评论 打赏 -
第一种是Notification，这个比较解耦。
-(void)viewDidLoad { // add a notification observer [NSNotificationCenter defaultCenter] addObserver:selector:name:object:] } -(void)handle { if (fileNameArr.count == 3) { // do something } } NSMutableArray *fileNameArr = [[NSMutableArray alloc]init]; for (int i= 0; i<[self.imgArr count]; i++) { NSData *data = [self.imgArr objectAtIndex:i]; [manager POST:url parameters:nil constructingBodyWithBlock: ^(id<AFMultipartFormData> formData){ [formData appendPartWithFileData:data name:@"pic" fileName:fileName mimeType:@"image/jpeg"]; } success:^(AFHTTPRequestOperation *operation,id responseObject) { NSLog(@"success:%@",responseObject); NSString *str = [[responseObject objectForKey:@"data"] objectForKey:@"fileName"]; [fileNameArr addObject:str]; NSString *ids = [[responseObject objectForKey: @"data"] objectForKey:@"ids"]; // add here [NSNotificationCenter defaultCenter] postNotificationName:object:] } failure:^(AFHTTPRequestOperation *operation,NSError *error){ NSLog(@"%@",error); }]; } 第二种就是，GCD啦，但是代码看起来耦合比较高。 NSMutableArray *fileNameArr = [[NSMutableArray alloc]init]; for (int i= 0; i<[self.imgArr count]; i++) { NSData *data = [self.imgArr objectAtIndex:i]; [manager POST:url parameters:nil constructingBodyWithBlock: ^(id<AFMultipartFormData> formData){ [formData appendPartWithFileData:data name:@"pic" fileName:fileName mimeType:@"image/jpeg"]; } success:^(AFHTTPRequestOperation *operation,id responseObject){ NSLog(@"success:%@",responseObject); NSString *str = [[responseObject objectForKey:@"data"] objectForKey:@"fileName"]; [fileNameArr addObject:str]; NSString *ids = [[responseObject objectForKey: @"data"] objectForKey:@"ids"]; // here if (fileNameArr.count == 3) { dispatch_async(dispatch_get_main_queue(), ^{ // handle }); } } failure:^(AFHTTPRequestOperation *operation,NSError *error){ NSLog(@"%@",error); }]; }2019-07-17 20:01:04赞同 展开评论 打赏
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