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  • IOS 将图片转换为圆角图

    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

    调用方法:

        UIImage * image = [UIImageimageNamed:@"123.jpg"];  // 设置原图

        CGSize size = CGSizeMake(100,100);  // 设置尺寸

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

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  • 原文地址:https://www.cnblogs.com/thefeelingofsimple/p/2918547.html
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