iphone - 如何显示来自 URL 的图像并在点击 UIButton 时显示它？

Question

我想知道如何在点击按钮时显示来自 URL(在 xml 文件中)的图像。

Answer 1

UIButton *myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
myButton.frame = CGRectMake(20, 20, 200, 44); // position in the parent view and set the size of the button
[myButton setTitle:@"Click Me!" forState:UIControlStateNormal];
// add targets and actions
[myButton addTarget:self action:@selector(buttonClicked) forControlEvents:UIControlEventTouchUpInside];
// add to a view
[superView addSubview:myButton];

点击按钮后的功能

-(void)buttonClicked{
    //urlString should be your image url which you want to access
    NSURL *url = [[NSURL alloc] initWithString:urlString ];
    NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
    NSData *urlData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:nil];
    UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
}

在你想显示的地方使用图片............