常规圆角设置方式就不说了
这里采用的是对 UIImage 进行处理，得到一个圆角的 UIImage。

关键代码

//对应于 ContentMode UIViewContentModeScaleAspectFit
- (CGSize)CGSizeAspectFit:(CGSize)aspectRatio bounding:(CGSize) boundingSize
{float mW = boundingSize.width / aspectRatio.width;float mH = boundingSize.height / aspectRatio.height;if( mH < mW )boundingSize.width = mH * aspectRatio.width;else if( mW < mH )boundingSize.height = mW * aspectRatio.height;return boundingSize;
}//对应于 ContentMode UIViewContentModeScaleAspectFill
- (CGSize)CGSizeAspectFill:(CGSize)aspectRatio minSize:(CGSize)minimumSize
{float mW = minimumSize.width / aspectRatio.width;float mH = minimumSize.height / aspectRatio.height;if( mH > mW )minimumSize.width = mH * aspectRatio.width;else if( mW > mH )minimumSize.height = mW * aspectRatio.height;return minimumSize;
}- (UIImage *)imageScaledToSize:(CGSize)size boundingSize:(CGSize)boundingSize cornerRadius:(CGFloat)cornerRadius borderWidth:(CGFloat)borderWidth borderColor:(UIColor *)borderColor
{//create drawing contextUIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);//需要将可视区域画到图片的中心CGFloat originX = (size.width-boundingSize.width)/2;originX = originX < 0 ? 0 : originX;CGFloat originY = (size.height-boundingSize.height)/2;originY = originY < 0 ? 0 : originY;[borderColor setStroke];UIBezierPath *bezierPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(originX, originY, boundingSize.width, boundingSize.height) cornerRadius:cornerRadius];[bezierPath setLineWidth:borderWidth];[bezierPath stroke];[bezierPath addClip];//draw[self drawInRect:CGRectMake(0.0f, 0.0f, size.width, size.height)];//capture resultant imageUIImage *image = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();return image;
}

参数说明

调用示例

CGSize scaleToSize = [image CGSizeAspectFill:image.size minSize:CGSizeMake(50.f, 50.f)];
image = [image imageScaledToSize:scaleToSizeboundingSize:CGSizeMake(50.f, 50.f)cornerRadius:5.fborderWidth:0.fborderColor:[UIColor colorWithWhite:0 alpha:0.2]];

高级进阶–画出聊天气泡样式的图片，避免使用大量使用 mask 而导致卡顿

效果图

构建气泡外形的 UIBezierPath

原料：PaintCode
示例文档：link PaintCode示例文档
说明：利用PaintCode得到的 UIBezierPath 的坐标都是绝对值，需要自己把所有的坐标点都改成相对边框的值（修改每个 x、y，工作量有点大）
要画什么样子的 UIBezierPath 取决于你的气泡设计（最好要熟练使用PaintCode）

关键代码

//将绝对值改成相对值后
- (UIBezierPath *)trangleRightPathInRect:(CGRect)rect {//画 UIBezierPath 的时候，出现了偏差，懒得重画，在这里手动修正CGFloat offset = 0.7f;CGFloat offset_y = 0.5f;CGPoint disPoint = CGPointMake(rect.size.width, rect.size.height);UIBezierPath* bezierPath = UIBezierPath.bezierPath;[bezierPath moveToPoint: CGPointMake(disPoint.x-2.38, 0.61+offset_y)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-1.02, 1.94+offset_y) controlPoint1: CGPointMake(disPoint.x-1.56, 0.82+offset_y) controlPoint2: CGPointMake(disPoint.x-1.02, 1.35+offset_y)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-1.08, 2.6+offset_y) controlPoint1: CGPointMake(disPoint.x - 1.02, 2.18+offset_y) controlPoint2: CGPointMake(disPoint.x-1.06, 2.51+offset_y)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x - 1.95,  3.86+offset_y) controlPoint1: CGPointMake(disPoint.x-1.2, 2.97+offset_y) controlPoint2: CGPointMake(disPoint.x - 1.44, 3.26+offset_y)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x - 8.5, 11.68+offset_y) controlPoint1: CGPointMake(disPoint.x - 1.95, 3.86+offset_y) controlPoint2: CGPointMake(disPoint.x-5.24, 7.79+offset_y)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x - 8.5, disPoint.y-6.61) controlPoint1: CGPointMake(disPoint.x - 8.5, 43.68) controlPoint2: CGPointMake(disPoint.x - 8.5, disPoint.y-6.61)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-8.8, disPoint.y-3.03) controlPoint1: CGPointMake(disPoint.x - 8.5, disPoint.y-4.85) controlPoint2: CGPointMake(disPoint.x-8.8, disPoint.y-3.03)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-11.03, disPoint.y-0.8) controlPoint1: CGPointMake(disPoint.x -9.18, disPoint.y-1.99) controlPoint2: CGPointMake(disPoint.x-9.99, disPoint.y-1.18)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-14.61, disPoint.y-0.5) controlPoint1: CGPointMake(disPoint.x-11.97, disPoint.y-0.5) controlPoint2: CGPointMake(disPoint.x-12.85, disPoint.y-0.5)];[bezierPath addLineToPoint: CGPointMake( 6.61+offset, disPoint.y-0.5)];[bezierPath addCurveToPoint: CGPointMake(3.03+offset, disPoint.y-0.8) controlPoint1: CGPointMake(4.85+offset, disPoint.y-0.5) controlPoint2: CGPointMake(3.03+offset, disPoint.y-0.8)];[bezierPath addCurveToPoint: CGPointMake(0.8+offset, disPoint.y-3.03) controlPoint1: CGPointMake(1.99+offset, disPoint.y-1.18) controlPoint2: CGPointMake(1.18+offset, disPoint.y-1.99)];[bezierPath addCurveToPoint: CGPointMake(0.5+offset, disPoint.y-6.61) controlPoint1: CGPointMake(0.5+offset, disPoint.y-3.97) controlPoint2: CGPointMake(0.5+offset, disPoint.y-4.85)];[bezierPath addLineToPoint: CGPointMake(0.5+offset, 6.61+offset_y)];[bezierPath addCurveToPoint: CGPointMake(0.8+offset, 3.03+offset_y) controlPoint1: CGPointMake(0.5+offset, 4.85+offset_y) controlPoint2: CGPointMake(0.8+offset, 3.03+offset_y)];[bezierPath addCurveToPoint: CGPointMake(3.03+offset, 0.8+offset_y) controlPoint1: CGPointMake(1.18+offset, 1.99+offset_y) controlPoint2: CGPointMake(1.99+offset, 1.18+offset_y)];[bezierPath addCurveToPoint: CGPointMake(6.61+offset, 0.5+offset_y) controlPoint1: CGPointMake(3.97+offset, 0.5+offset_y) controlPoint2: CGPointMake(4.85+offset, 0.5+offset_y)];[bezierPath addLineToPoint: CGPointMake(disPoint.x-4.36+offset, 0.5+offset_y)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-2.38, 0.61+offset_y) controlPoint1: CGPointMake(disPoint.x-3.39, 0.5+offset_y) controlPoint2: CGPointMake(disPoint.x-2.9, 0.5+offset_y)];[bezierPath setLineWidth:1.f];[bezierPath closePath];return bezierPath;
}- (UIBezierPath *)trangleLeftPathInRect:(CGRect)rect {CGPoint disPoint = CGPointMake(rect.size.width, rect.size.height);UIBezierPath* bezierPath = UIBezierPath.bezierPath;[bezierPath moveToPoint: CGPointMake(2.38, 0.61)];[bezierPath addCurveToPoint: CGPointMake(1.02, 1.94) controlPoint1: CGPointMake(1.56, 0.82) controlPoint2: CGPointMake(1.02, 1.35)];[bezierPath addCurveToPoint: CGPointMake(1.08, 2.6) controlPoint1: CGPointMake(1.02, 2.18) controlPoint2: CGPointMake(1.06, 2.51)];[bezierPath addCurveToPoint: CGPointMake(1.95, 3.86) controlPoint1: CGPointMake(1.2, 2.97) controlPoint2: CGPointMake(1.44, 3.26)];[bezierPath addCurveToPoint: CGPointMake(8.5, 11.68) controlPoint1: CGPointMake(1.95, 3.86) controlPoint2: CGPointMake(5.24, 7.79)];[bezierPath addCurveToPoint: CGPointMake(8.5, disPoint.y-6.61) controlPoint1: CGPointMake(8.5, 43.68) controlPoint2: CGPointMake(8.5, disPoint.y-6.61)];[bezierPath addCurveToPoint: CGPointMake(8.8, disPoint.y-3.03) controlPoint1: CGPointMake(8.5, disPoint.y-4.85) controlPoint2: CGPointMake(8.8, disPoint.y-3.03)];[bezierPath addCurveToPoint: CGPointMake(11.03, disPoint.y-0.8) controlPoint1: CGPointMake(9.18, disPoint.y-1.99) controlPoint2: CGPointMake(9.99, disPoint.y-1.18)];[bezierPath addCurveToPoint: CGPointMake(14.61, disPoint.y-0.5) controlPoint1: CGPointMake(11.97, disPoint.y-0.5) controlPoint2: CGPointMake(12.85, disPoint.y-0.5)];[bezierPath addLineToPoint: CGPointMake(disPoint.x-6.61, disPoint.y-0.5)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-3.03, disPoint.y-0.8) controlPoint1: CGPointMake(disPoint.x-4.85, disPoint.y-0.5) controlPoint2: CGPointMake(disPoint.x-3.03, disPoint.y-0.8)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-0.8, disPoint.y-3.03) controlPoint1: CGPointMake(disPoint.x-1.99, disPoint.y-1.18) controlPoint2: CGPointMake(disPoint.x-1.18, disPoint.y-1.99)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-0.5, disPoint.y-6.61) controlPoint1: CGPointMake(disPoint.x-0.5, disPoint.y-3.97) controlPoint2: CGPointMake(disPoint.x-0.5, disPoint.y-4.85)];[bezierPath addLineToPoint: CGPointMake(disPoint.x-0.5, 6.61)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-0.8, 3.03) controlPoint1: CGPointMake(disPoint.x-0.5, 4.85) controlPoint2: CGPointMake(disPoint.x-0.8, 3.03)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-3.03, 0.8) controlPoint1: CGPointMake(disPoint.x-1.18, 1.99) controlPoint2: CGPointMake(disPoint.x-1.99, 1.18)];[bezierPath addCurveToPoint: CGPointMake(disPoint.x-6.61, 0.5) controlPoint1: CGPointMake(disPoint.x-3.97, 0.5) controlPoint2: CGPointMake(disPoint.x-4.85, 0.5)];[bezierPath addLineToPoint: CGPointMake(4.36, 0.5)];[bezierPath addCurveToPoint: CGPointMake(2.38, 0.61) controlPoint1: CGPointMake(3.39, 0.5) controlPoint2: CGPointMake(2.9, 0.5)];[bezierPath setLineWidth:1.f];[bezierPath closePath];return bezierPath;
}- (UIImage *)trangleImage:(UIImage *)image inRect:(CGRect)rect bezierPath:(UIBezierPath *)bezierPath {// Begin a new image that will be the new image with the rounded corners// (here with the size of an UIImageView)UIGraphicsBeginImageContextWithOptions(rect.size, NO, [UIScreen mainScreen].scale);// Add a clip before drawing anything, in the shape of an rounded rect[[UIColor colorWithWhite:0 alpha:0.12] setStroke];[bezierPath stroke];[bezierPath addClip];// Draw your image[image drawInRect:rect];// Get the image, here setting the UIImageView imageUIImage *trangleImage = UIGraphicsGetImageFromCurrentImageContext();// Lets forget about that we were drawingUIGraphicsEndImageContext();return trangleImage;
}

总结

iOS的圆角开销还是比较大的，一旦滥用，必定会引起卡顿，合理的避免使用 mask layer 和 CornerRadius 属性，可以有效的提高性能。

如果可以，记得要缓存处理成圆角的image，不然频繁的绘制也会造成卡顿。

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iOS 高性能图片圆角

关键代码

参数说明

调用示例

高级进阶–画出聊天气泡样式的图片，避免使用大量使用 mask 而导致卡顿

效果图

构建气泡外形的 UIBezierPath

关键代码

总结

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