20170524关于图片的贝塞尔、CGContext圆角裁剪

这种裁剪只能裁剪png格式图片，请注意。个人能力不足，希望大家一起思维碰撞。

#import

@interface UIImage (QKCornerRadius)

+(UIImage*)UIBezierPathClip:(UIImage*)img cornerRadius:(CGFloat)c;

+(UIImage*)CGContextClip:(UIImage*)img cornerRadius:(CGFloat)c;

@end

//

//Created by郑乾坤on 2017/5/24.

//Copyright © 2017年ZW. All rights reserved.

//

#import "UIImage+QKCornerRadius.h"

@implementation UIImage (QKCornerRadius)

// CGContext裁剪

+(UIImage*)CGContextClip:(UIImage*)img cornerRadius:(CGFloat)c {

intw = img.size.width* img.scale;

inth = img.size.height* img.scale;

UIGraphicsBeginImageContextWithOptions(CGSizeMake(w, h),false,1.0);

CGContextRefcontext =UIGraphicsGetCurrentContext();

CGContextMoveToPoint(context,0, c);

CGContextAddArcToPoint(context,0,0, c,0, c);

CGContextAddLineToPoint(context, w-c,0);

CGContextAddArcToPoint(context, w,0, w, c, c);

CGContextAddLineToPoint(context, w, h-c);

CGContextAddArcToPoint(context, w, h, w-c, h, c);

CGContextAddLineToPoint(context, c, h);

CGContextAddArcToPoint(context,0, h,0, h-c, c);

CGContextAddLineToPoint(context,0, c);

CGContextClosePath(context);

CGContextClip(context);//先裁剪context，再画图，就会在裁剪后的path中画

[imgdrawInRect:CGRectMake(0,0, w, h)];//画图

CGContextDrawPath(context,kCGPathFill);

UIImage*ret =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnret;

}

// UIBezierPath裁剪

+(UIImage*)UIBezierPathClip:(UIImage*)img cornerRadius:(CGFloat)c {

intw = img.size.width* img.scale;

inth = img.size.height* img.scale;

CGRectrect =CGRectMake(0,0, w, h);

UIGraphicsBeginImageContextWithOptions(CGSizeMake(w, h),false,1.0);

[[UIBezierPathbezierPathWithRoundedRect:rectcornerRadius:c]addClip];

[imgdrawInRect:rect];

UIImage*ret =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returnret;

}

@end