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新建UIImage分类如下：

@interface UIImage (RoundedRectImage)- (UIImage *)setRoundedCorners:(CGFloat)radius andSize:(CGSize)size;@end

#import "UIImage+RoundedRectImage.h"@implementation UIImage (RoundedRectImage)- (UIImage *)setRoundedCorners:(CGFloat)radius andSize:(CGSize)size{    CGRect rect = CGRectMake(0, 0, size.width, size.height);    UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);    CGContextRef ctx = UIGraphicsGetCurrentContext();    UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(radius, radius)];    CGContextAddPath(ctx,path.CGPath);    CGContextClip(ctx);    [self drawInRect:rect];    CGContextDrawPath(ctx, kCGPathFillStroke);    UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return newImage;}

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