ios – 是否存在UIImage完成加载的事件

概述我正在使用以下代码显示UI Image视图： NSURL *imageUrl = [[NSURL alloc]initWithString:@"http://..."];NSData *imageData = [[NSData alloc] initWithContentsOfURL:imageUrl];UIImage *audioArt =[[UIImage alloc] initWithD 我正在使用以下代码显示UI Image视图：

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.

解决方法 在你的.h

@interface YourClass : YourSuperclass<NSURLConnectionDataDelegate>@property (nonatomic) NSMutableData *imageData;@property (nonatomic) NSUInteger totalBytes;@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.totalBytes = length.unsignedIntegerValue;    [self.imageData = [[NSMutableData alloc] initWithLength:self.totalBytes];}- (voID)connection:(NSURLConnection *)connection dIDReceiveData:(NSData *)data{    [self.imageData appendData:data];    self.receivedBytes += data.length;    // Actual progress is self.receivedBytes / self.totalBytes}- (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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