UIImage的圆角 [英] Rounded Corners on UIImage
问题描述
我试图在iPhone上使用圆角绘制图像，在联系人应用程序中的联系人图片。我有代码一般工作，但它偶尔崩溃内部的UIImage绘图例程与 EXEC_BAD_ACCESS - KERN_INVALID_ADDRESS 。我认为这可能与裁剪问题有关，我几个星期后回答，但我相信我' m正确设置剪切路径。
这里是我使用的代码 - 当它不崩溃，结果看起来很好，任何人寻找类似的外观可以自由借用代码。
- （UIImage *）borderedImageWithRect：（CGRect）dstRect radius：（CGFloat）radius {
UIImage * maskedImage = nil;
radius = MIN（radius，.5 * MIN（CGRectGetWidth（dstRect），CGRectGetHeight（dstRect）））;
CGRect interiorRect = CGRectInset（dstRect，radius，radius）;
UIGraphicsBeginImageContext（dstRect.size）;
CGContextRef maskedContextRef = UIGraphicsGetCurrentContext（）;
CGContextSaveGState（maskedContextRef）;
CGMutablePathRef borderPath = CGPathCreateMutable（）;
CGPathAddArc（borderPath，NULL，CGRectGetMinX（interiorRect），CGRectGetMinY（interiorRect），radius，PNDegreeToRadian（180），PNDegreeToRadian（270），NO）;
CGPathAddArc（borderPath，NULL，CGRectGetMaxX（interiorRect），CGRectGetMinY（interiorRect），radius，PNDegreeToRadian（270.0），PNDegreeToRadian（360.0），NO）;
CGPathAddArc（borderPath，NULL，CGRectGetMaxX（interiorRect），CGRectGetMaxY（interiorRect），radius，PNDegreeToRadian（0.0），PNDegreeToRadian（90.0），NO）;
CGPathAddArc（borderPath，NULL，CGRectGetMinX（interiorRect），CGRectGetMaxY（interiorRect），radius，PNDegreeToRadian（90.0），PNDegreeToRadian（180.0），NO）;
CGContextBeginPath（maskedContextRef）;
CGContextAddPath（maskedContextRef，borderPath）;
CGContextClosePath（maskedContextRef）;
CGContextClip（maskedContextRef）;
[self drawInRect：dstRect];
maskedImage = UIGraphicsGetImageFromCurrentImageContext（）;
CGContextRestoreGState（maskedContextRef）;
UIGraphicsEndImageContext（）;
return maskedImage;
}
这里是崩溃日志。
异常类型：EXC_BAD_ACCESS（SIGSEGV）
异常代码：KERN_INVALID_ADDRESS at 0x6e2e6181
崩溃的线程：0
线程0崩溃：
0 com.apple.CoreGraphics 0x30fe56d8 CGGStateGetRenderingIntent + 4
1 libRIP.A.dylib 0x33c4a7d8 ripc_RenderImage + 104
2 libRIP.A.dylib 0x33c51868 ripc_DrawImage + 3860
3 com.apple.CoreGraphics 0x30fecad4 CGContextDelegateDrawImage + 80
4 com.apple.CoreGraphics 0x30feca40 CGContextDrawImage + 368
5 UIKit 0x30a6a708 - [UIImage drawInRect：blendMode：alpha：] + 1460
6 UIKit 0x30a66904 - [UIImage drawInRect：] + 72
7 MyApp 0x0003f8a8 - [UIImage（PNAdditions）borderedImageWithRect：radius：]（UIImage + PNAdditions.m：187 ）
解决方案这是一个更容易的方法，可用于iPhone 3.0及以上。每个基于视图的对象都有一个关联的图层。每一层都可以设置一个角半径，这将给你你想要的：
UIImageView * roundedView = [[UIImageView alloc ] initWithImage：[UIImage imageNamed：@wood.jpg]];
//获取任意视图的图层
CALayer * l = [roundedView layer];
[l setMasksToBounds：YES];
[l setCornerRadius：10.0];
//你甚至可以添加边框
[l setBorderWidth：4.0];
[l setBorderColor：[[UIColor blueColor] CGColor]];
I'm trying to draw images on the iPhone using with rounded corners, a la the contact images in the Contacts app. I've got code that generally work, but it occasionally crashes inside of the UIImage drawing routines with an
EXEC_BAD_ACCESS-KERN_INVALID_ADDRESS. I thought this might be related to the cropping question I asked a few weeks back, but I believe I'm setting up the clipping path correctly.Here's the code I'm using - when it doesn't crash, the result looks fine and anybody looking to get a similar look is free to borrow the code.
- (UIImage *)borderedImageWithRect: (CGRect)dstRect radius:(CGFloat)radius { UIImage *maskedImage = nil; radius = MIN(radius, .5 * MIN(CGRectGetWidth(dstRect), CGRectGetHeight(dstRect))); CGRect interiorRect = CGRectInset(dstRect, radius, radius); UIGraphicsBeginImageContext(dstRect.size); CGContextRef maskedContextRef = UIGraphicsGetCurrentContext(); CGContextSaveGState(maskedContextRef); CGMutablePathRef borderPath = CGPathCreateMutable(); CGPathAddArc(borderPath, NULL, CGRectGetMinX(interiorRect), CGRectGetMinY(interiorRect), radius, PNDegreeToRadian(180), PNDegreeToRadian(270), NO); CGPathAddArc(borderPath, NULL, CGRectGetMaxX(interiorRect), CGRectGetMinY(interiorRect), radius, PNDegreeToRadian(270.0), PNDegreeToRadian(360.0), NO); CGPathAddArc(borderPath, NULL, CGRectGetMaxX(interiorRect), CGRectGetMaxY(interiorRect), radius, PNDegreeToRadian(0.0), PNDegreeToRadian(90.0), NO); CGPathAddArc(borderPath, NULL, CGRectGetMinX(interiorRect), CGRectGetMaxY(interiorRect), radius, PNDegreeToRadian(90.0), PNDegreeToRadian(180.0), NO); CGContextBeginPath(maskedContextRef); CGContextAddPath(maskedContextRef, borderPath); CGContextClosePath(maskedContextRef); CGContextClip(maskedContextRef); [self drawInRect: dstRect]; maskedImage = UIGraphicsGetImageFromCurrentImageContext(); CGContextRestoreGState(maskedContextRef); UIGraphicsEndImageContext(); return maskedImage; }and here's the crash log. It looks the same whenever I get one of these crashes
Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x6e2e6181 Crashed Thread: 0 Thread 0 Crashed: 0 com.apple.CoreGraphics 0x30fe56d8 CGGStateGetRenderingIntent + 4 1 libRIP.A.dylib 0x33c4a7d8 ripc_RenderImage + 104 2 libRIP.A.dylib 0x33c51868 ripc_DrawImage + 3860 3 com.apple.CoreGraphics 0x30fecad4 CGContextDelegateDrawImage + 80 4 com.apple.CoreGraphics 0x30feca40 CGContextDrawImage + 368 5 UIKit 0x30a6a708 -[UIImage drawInRect:blendMode:alpha:] + 1460 6 UIKit 0x30a66904 -[UIImage drawInRect:] + 72 7 MyApp 0x0003f8a8 -[UIImage(PNAdditions) borderedImageWithRect:radius:] (UIImage+PNAdditions.m:187)
解决方案Here is an even easier method that is available in iPhone 3.0 and up. Every View-based object has an associated layer. Each layer can have a corner radius set, this will give you just what you want:
UIImageView * roundedView = [[UIImageView alloc] initWithImage: [UIImage imageNamed:@"wood.jpg"]]; // Get the Layer of any view CALayer * l = [roundedView layer]; [l setMasksToBounds:YES]; [l setCornerRadius:10.0]; // You can even add a border [l setBorderWidth:4.0]; [l setBorderColor:[[UIColor blueColor] CGColor]];
这篇关于UIImage的圆角的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
