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
让明天,不后悔今天的所作所为
posted on 2015-07-15 14:11 Sinner_Yun 阅读(263) 评论(0) 编辑 收藏 举报