在iOS上观看8

Question

失去cornerRadius与UIViewAnimationOptionTransitionFlipFromLeft的动画在代码中，我已设置：

imageView.layer.masksToBounds = YES; 
imageView.layer.cornerRadius = imageView.frame.size.width/2; 

而且在动画块运行它：

[UIView transitionWithView:imageView 
         duration:1.0 
         options:UIViewAnimationOptionTransitionFlipFromLeft 
        animations:nil 
        completion:^(BOOL finished) { 
         imageView.hidden = YES; 
        }]; 

但在iOS 8，运行时， imageView恢复正常，表示imageView没有cornerRadius。

谁能告诉我为什么？

Answer 1

你需要使用CALayer使用下面的代码削减的UIImage不UIImageView角落。

// load image on imageView programmatically 
UIImage *image = [UIImage imageNamed:@"yourImage.png"]; 

// assign the changes reflected using method before load image to imageView 
image = [self makeRoundedImage:image radius:_imageView.frame.size.width/2]; 
_imageView.image = image; 

---

// method to create round image 
-(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.masksToBounds = YES; 
    imageLayer.cornerRadius = radius; 

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

    return roundedImage; 
} 

现在，你可以简单地套用动画。