UIImage上的圆角？
UIImage上的圆角？
提问于 2018-05-02 04:49:45
我正尝试在iPhone上使用圆角绘制图像，在联系人应用中使用联系人图像。我有一些通常可以工作的代码，但它偶尔会在UIImage绘图程序中使用EXEC_BAD_ACCESS - KERN_INVALID_ADDRESS。
这里是我使用的代码 ：
- (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。每当我遇到这些崩溃时，它看起来都是一样的
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）
回答 2
Stack Overflow用户
发布于 2018-05-02 13:00:54
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]];Stack Overflow用户
发布于 2018-05-02 14:26:47
UIImage+Adadtions.h
#import <UIKit/UIKit.h>
@interface UIImage (additions)
-(UIImage*)makeRoundCornersWithRadius:(const CGFloat)RADIUS;
@endUIImage+Adadtions.m
#import "UIImage+additions.h"
@implementation UIImage (additions)
-(UIImage*)makeRoundCornersWithRadius:(const CGFloat)RADIUS {
UIImage *image = self;
// Begin a new image that will be the new image with the rounded corners
// (here with the size of an UIImageView)
UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
const CGRect RECT = CGRectMake(0, 0, image.size.width, image.size.height);
// Add a clip before drawing anything, in the shape of an rounded rect
[[UIBezierPath bezierPathWithRoundedRect:RECT cornerRadius:RADIUS] addClip];
// Draw your image
[image drawInRect:RECT];
// Get the image, here setting the UIImageView image
//imageView.image
UIImage* imageNew = UIGraphicsGetImageFromCurrentImageContext();
// Lets forget about that we were drawing
UIGraphicsEndImageContext();
return imageNew;
}
@end页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/-100008321
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