Question

我正在将一个UIButton的ImageView.Image属性设置为从ImagePickerController捕获的图像。在我的应用程序中，图像被捕获并带有边框圆角。图像已保存，我正在将图像加载到按钮中。问题是，按钮只显示一个蓝色圆圈，而不是里面的图像...这似乎只发生在按钮上。

这是我的代码来舍入图像并设置边框：

-(UIImage *)makeRoundedImage:(UIImage *) image
                  radius: (float) radius;
{
CALayer *imageLayer = [CALayer layer];
imageLayer.frame = CGRectMake(0, 0, image.size.width, image.size.height);
imageLayer.contents = (id) image.CGImage;
imageLayer.backgroundColor = [[UIColor clearColor] CGColor];

imageLayer.masksToBounds = YES;
imageLayer.cornerRadius = radius;
imageLayer.borderWidth = 40;
UIColor *ios7BlueColor = [UIColor colorWithRed:0.0 green:122.0/255.0 blue:1.0 alpha:1.0];
imageLayer.borderColor = ios7BlueColor.CGColor;

UIGraphicsBeginImageContext(image.size);
[imageLayer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *roundedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

return roundedImage;
}

以下是我设置按钮图像的方法：（player.playerImage是一个带有保存图像路径的礼貌字符串）

-(void)ViewController:(UIViewController *)sender didUpdatePlayerImage:(NSString *)playerImagePath
{

player.playerImage = playerImagePath;
[_editImageButton setImage:[UIImage imageWithContentsOfFile:player.playerImage] forState:UIControlStateNormal];
}

这是对UIButton的ImageView实现的限制还是我遗漏了什么？

Answer 1

您实际上并没有将原始图像写入上下文。

尝试以下方法：

UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
[imageLayer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *roundedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

这应该将图像渲染到上下文中，然后是图层。

UIButton ImageView仅显示颜色填充

1 个答案: