大佬教程收集整理的这篇文章主要介绍了ios – 是否存在UIImage完成加载的事件，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
NSURL *imageUrl = [[NSURL alloc]initWithString:@"http://..."]; NSData *imageData = [[NSData alloc] initWithContentsOfURL:imageUrl]; UIImage *audioArt =[[UIImage alloc] initWithData:imageData]; UIImageView *artView =[[UIImageView alloc] initWithImage:audioArt]; artView.contentMode = UIViewContentModeScaleAspectFit; artView.autoresizesSubviews = NO; artView.frame = viewRef.bounds; [artView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight]; [artView setBACkgroundColor:[UIColor blackColor]]; [viewRef setBACkgroundColor:[UIColor blackColor]]; [viewRef addSubview:artView];
在Objective C中是否有一个事件告诉UIImage何时完成加载或UIImageView何时完成显示图像？
非常感谢.
@interface YourClass : YourSuperclass<NSURLConnectionDataDelegate> @property (nonatomiC) NSMutableData *imageData; @property (nonatomiC) NSUInteger @R_552_10586@lBytes; @property (nonatomiC) NSUInteger receivedBytes;
并在某处打电话
NSURL *imageUrl = [[NSURL alloc]initWithString:@"http://..."]; NSURLrequest *request = [NSURLrequest requestWithURL: imageUrl]; NSURLConnection *connection = [NSURLConnection alloc] initWithrequest:request delegate:self startImmediately:YES];
并且还实现委托方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { NShttpURLResponse *httpResponse = (NShttpURLResponse *) urlResponse; NSDictionary *Dict = httpResponse.allHeaderFields; NSString *lengthString = [Dict valueForKey:@"Content-Length"]; NSnumberFormatter *formatter = [[NSnumberFormatter alloc] init]; NSnumber *length = [formatter numberFromString:lengthString]; self.@R_552_10586@lBytes = length.unsignedIntegerValue; [self.imageData = [[NSMutableData alloc] initWithLength:self.@R_552_10586@lBytes]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [self.imageData appendData:data]; self.receivedBytes += data.length; // Actual progress is self.receivedBytes / self.@R_552_10586@lBytes } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { imageView.image = [UIImage imageWithData:self.imageData]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { //handle error }
更新：
由于NSMutableData initWithLength：创建一个原始数据用零填充的数据对象,用init只替换initWithLength：它会起作用.
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