iOS--建立圓角圖片的又一方法

UIImage+additions.h

#import <UIKit/UIKit.h>
@interface UIImage (additions)
-(UIImage*)makeRoundCornersWithRadius:(const CGFloat)RADIUS;
@end

UIImage+additions.m  

#import "UIImage+additions.h"

@implementation UIImage (additions)
-(UIImage*)makeRoundCornersWithRadius:(const CGFloat)RADIUS {
UIImage *image = self;

// Begin a new image that will be the new image with the rounded corners
// (here with the size of an UIImageView)
UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);

const CGRect RECT = CGRectMake(0, 0, image.size.width, image.size.height);
// Add a clip before drawing anything, in the shape of an rounded rect
[[UIBezierPath bezierPathWithRoundedRect:RECT cornerRadius:RADIUS] addClip];
// Draw your image
[image drawInRect:RECT];

// Get the image, here setting the UIImageView image
//imageView.image
UIImage* imageNew = UIGraphicsGetImageFromCurrentImageContext();

// Lets forget about that we were drawing
UIGraphicsEndImageContext();

return imageNew;
}
@end