设置UIView圆角 cornerRadius 圆角有性能问题，用贝塞尔曲线代替

[objc] view plaincopyprint?

1. @interface UIView (RectCorner)  
2.   
3. @end  
4.   
5. @implementation UIView (RectCorner)  
6. - (void)setCornerOnTop {  
7.     UIBezierPath *maskPath;  
8.     maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds  
9.                                      byRoundingCorners:(UIRectCornerTopLeft | UIRectCornerTopRight)  
10.                                            cornerRadii:CGSizeMake(10.0f, 10.0f)];  
11.     CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];  
12.     maskLayer.frame = self.bounds;  
13.     maskLayer.path = maskPath.CGPath;  
14.     self.layer.mask = maskLayer;  
15.     [maskLayer release];  
16. }  
17. - (void)setCornerOnBottom {  
18.     UIBezierPath *maskPath;  
19.     maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds  
20.                                      byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight)  
21.                                            cornerRadii:CGSizeMake(10.0f, 10.0f)];  
22.     CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];  
23.     maskLayer.frame = self.bounds;  
24.     maskLayer.path = maskPath.CGPath;  
25.     self.layer.mask = maskLayer;  
26.     [maskLayer release];  
27. }  
28. - (void)setAllCorner {  
29.     UIBezierPath *maskPath;  
30.     maskPath = [UIBezierPath bezierPathWithRoundedRect:self.bounds  
31.                                           cornerRadius:10.0];  
32.     CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];  
33.     maskLayer.frame = self.bounds;  
34.     maskLayer.path = maskPath.CGPath;  
35.     self.layer.mask = maskLayer;  
36.     [maskLayer release];  
37. }  
38. - (void)setNoneCorner{  
39.     self.layer.mask = nil;  
40. }  
41.   
42. @end  

- (UIImageView *)imageWithRoundedCornersSize:(float)cornerRadius 
{
    UIImageView *imageView = self;
    UIImage * original = self.image;
    // Begin a new image that will be the new image with the rounded corners
    // (here with the size of an UIImageView)
    UIGraphicsBeginImageContextWithOptions(imageView.bounds.size, NO, [UIScreen mainScreen].scale); //[UIScreen mainScreen].scale
    
    // Add a clip before drawing anything, in the shape of an rounded rect
    [[UIBezierPath bezierPathWithRoundedRect:imageView.bounds
                                cornerRadius:cornerRadius] addClip];
    // Draw your image
    [original drawInRect:imageView.bounds];
    
    // Get the image, here setting the UIImageView image
    imageView.image = UIGraphicsGetImageFromCurrentImageContext();
    
    // Lets forget about that we were drawing
    UIGraphicsEndImageContext();
    
    return imageView;
}

设置UIView圆角 cornerRadius 圆角有性能问题，用贝塞尔曲线代替

原文：http://blog.csdn.net/shaobo8910/article/details/46779259