IOS 將圖片轉換為圓角圖

UIImage+wiRoundedRectImage.h

#import <UIKit/UIKit.h>@interface UIImage (wiRoundedRectImage)+ (id)createRoundedRectImage:(UIImage*)image size:(CGSize)size radius:(NSInteger)r;@end

 

UIImage+wiRoundedRectImage.m

#import "UIImage+wiRoundedRectImage.h"@implementation UIImage (wiRoundedRectImage)static void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth,                                 float ovalHeight){    float fw, fh;        if (ovalWidth == 0 || ovalHeight == 0)    {        CGContextAddRect(context, rect);        return;    }        CGContextSaveGState(context);    CGContextTranslateCTM(context, CGRectGetMinX(rect), CGRectGetMinY(rect));    CGContextScaleCTM(context, ovalWidth, ovalHeight);    fw = CGRectGetWidth(rect) / ovalWidth;    fh = CGRectGetHeight(rect) / ovalHeight;        CGContextMoveToPoint(context, fw, fh/2);  // Start at lower right corner    CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1);  // Top right corner    CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1); // Top left corner    CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1); // Lower left corner    CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); // Back to lower right        CGContextClosePath(context);    CGContextRestoreGState(context);}+ (id)createRoundedRectImage:(UIImage*)image size:(CGSize)size radius:(NSInteger)r{    // the size of CGContextRef    int w = size.width;    int h = size.height;        UIImage *img = image;    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);    CGRect rect = CGRectMake(0, 0, w, h);        CGContextBeginPath(context);    addRoundedRectToPath(context, rect, r, r);    CGContextClosePath(context);    CGContextClip(context);    CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);    CGImageRef imageMasked = CGBitmapContextCreateImage(context);    img = [UIImage imageWithCGImage:imageMasked];        CGContextRelease(context);    CGColorSpaceRelease(colorSpace);    CGImageRelease(imageMasked);        return img;}@end

 

調用方法:

    UIImage * image = [UIImageimageNamed:@"123.jpg"];  // 設定原圖

    CGSize size = CGSizeMake(100,100);  // 設定尺寸

    _pImgV.image = [UIImagecreateRoundedRectImage:image size:size radius:10];   // 設定radius