Draw roundCorner image in iPhone with sdk

  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); CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1); CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1); CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1); CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); CGContextClosePath(context); CGContextRestoreGState(context); } - (UIImage *) roundCorners: (UIImage*) img{ int w = img.size.width; int h = img.size.height; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); CGContextBeginPath(context); CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height); addRoundedRectToPath(context, rect, 100, 100); CGContextClosePath(context); CGContextClip(context); CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage); CGImageRef imageMasked = CGBitmapContextCreateImage(context); CGContextRelease(context); CGColorSpaceRelease(colorSpace); [img release]; return [UIImage imageWithCGImage:imageMasked];}// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.- (void)viewDidLoad {image = [UIImage imageNamed:@"Free.png"];imaged = [self roundCorners:image];CGRect myImageRect = CGRectMake(30.0f, 30.0f, 160.0f, 230.0f);UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];[myImage setImage:imaged];//myImage.opaque = YES; // explicitly opaque for performance[self.view addSubview:myImage];[myImage release]; [super viewDidLoad];}

 

参照别的的做的一个，现在好像有个什么简单的，直接设置属性就可以了

//还没测试，测试一下再修改

图片圆角 image round corner:m_mainImgView.layer.cornerRadius = 6;m_mainImgView.layer.masksToBounds = YES;自动适应,保持图片宽高比 aspect fit:m_mainImgView.contentMode = UIViewContentModeScaleAspectFit;