为什么这个AsyncImageView没有加载图像？

Question

我有以下代码：

-(void) viewDidAppear:(BOOL)animated {
    AsyncImageView *weatherImageView = [[AsyncImageView alloc] initWithFrame:weatherImage.frame];
    NSString *myString = @"http://openweathermap.org/img/w/10d.png";
    NSString *url = [NSString stringWithString:myString];
    NSLog(@"The complete url is %@", url);
    [weatherImageView loadImageFromURL:url];
    [self.weatherImage addSubview:weatherImageView];
}

图片网址一切正常，但视图显示时图片不会显示。

但是如果我用同样的方法写下面这行

-(void) viewDidAppear: (BOOL) animated {
        [self.weatherImage setImage:[UIImage imageNamed:[UIImage imageNamed:"background.png"]]];
}

我看到＆＃34; background.png＆＃34;在ImageView中显得很整洁。

想知道第一个代码有什么问题。

Answer 1

loadImageFromURL期待NSURL。不是NSString：

AsyncImageView *weatherImageView = [[AsyncImageView alloc] initWithFrame:weatherImage.frame];
NSString *myString = @"http://openweathermap.org/img/w/10d.png";
NSURL *url = [NSURL URLWithString:myString];
NSLog(@"The complete url is %@", url);
[weatherImageView loadImageFromURL:url];