前言
众所周知在开发中不可避免的会遇到一些图片和视图的处理，我这里总结的这些只是我遇到的一些，以供下次使用查看。下面话不多说了，来一起看看详细的介绍吧。
图片的旋转
是UIImage的扩展类，直接使用UIImage的对象调用即可
UIImage
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#import <QuartzCore/QuartzCore.h>#import <Accelerate/Accelerate.h> @implementation UIImage (ImageRotate)-(UIImage *)imageRotateIndegree:(float)degree{ //1.image-》context size_t width = (size_t)(self.size.width *self.scale); size_t height = (size_t)(self.size.height*self.scale); size_t bytesPerRow = width * 4;//表明每行图片数据字节 CGImageAlphaInfo alphaInfo = kCGImageAlphaPremultipliedFirst;//alpha //配置上下文参数 CGContextRef bmContext = CGBitmapContextCreate(NULL, width, height, 8, bytesPerRow, CGColorSpaceCreateDeviceRGB(), kCGBitmapByteOrderDefault | alphaInfo); if (!bmContext) { return nil; } CGContextDrawImage(bmContext, CGRectMake(0, 0, width, height), self.CGImage); //2旋转 UInt8 *data = (UInt8*)CGBitmapContextGetData(bmContext); vImage_Buffer src = {data,height,width,bytesPerRow}; vImage_Buffer dest = {data,height,width,bytesPerRow}; Pixel_8888 bgColor = {0,0,0,0}; vImageRotate_ARGB8888(&src, &dest, NULL, degree, bgColor, kvImageBackgroundColorFill); //3context-》UIImage CGImageRef rotateImageref = CGBitmapContextCreateImage(bmContext); UIImage *rotateImage = [UIImage imageWithCGImage:rotateImageref scale:self.scale orientation:self.imageOrientation]; return rotateImage;}@end |
图片的裁剪
依然是UIImage的扩展类，直接使用UIImage的对象调用即可
UIImage
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@implementation UIImage (ImageCut) -(UIImage *)ImageCutSize:(CGRect)rect{ CGImageRef subImageref = CGImageCreateWithImageInRect(self.CGImage, rect); CGRect smallRef = CGRectMake(0, 0, CGImageGetWidth(subImageref), CGImageGetHeight(subImageref)); UIGraphicsBeginImageContext(smallRef.size); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextDrawImage(context, smallRef, subImageref); UIImage *image = [UIImage imageWithCGImage:subImageref]; UIGraphicsEndImageContext(); return image;}@end |
获取截屏
截屏是UIView的扩展类
UIView
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@implementation UIView (imageScreenShot)- (UIImage *)imageScreenShot{ UIGraphicsBeginImageContext(self.frame.size); [self.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *imageNew = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return imageNew;}@end |
使用方法
UIView
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- (void)imageScreen{ UIImage *imageNew = [self.view imageScreenShot]; UIImageWriteToSavedPhotosAlbum(imageNew, nil, nil, nil); //直接保存在相册里，要获取相册权限} |
图片比例处理
依然是UIImage的扩展类
UIImage
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@implementation UIImage (imageScaleSize) - (UIImage *) scaleImage:(UIImage *)image toScale:(float)scaleSize{ UIGraphicsBeginImageContext(CGSizeMake(image.size.width * scaleSize, image.size.height * scaleSize)); [image drawInRect:CGRectMake(0, 0, image.size.width * scaleSize, image.size.height * scaleSize)]; UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return scaledImage;}@end |
view添加圆角
这里是UIView的扩展类，适用于所有的View，可以设置添加的位置
UIView
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@implementation UIView (LSCore) /** 设置部分圆角 绝对布局 @param corners 需要设置为圆角的角 UIRectCornerTopLeft|UIRectCornerTopRight @param radii 需要设置的圆角大小 CGSizeMake(5.0, 5.0) */- (void)addRoundedCorners:(UIRectCorner)corners withRadii:(CGSize)radii{ UIBezierPath *rounded = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:radii]; CAShapeLayer *shape = [[CAShapeLayer alloc] init]; [shape setPath:rounded.CGPath]; self.layer.mask = shape;} /** 设置部分圆角 相对布局 @param corners 需要设置为圆角的角 UIRectCornerTopLeft|UIRectCornerTopRight @param radii 需要设置的圆角大小 CGSizeMake(5.0, 5.0) @param rect 需要设置的圆角view的rect */- (void)addRoundedCorners:(UIRectCorner)corners withRadii:(CGSize)radii viewRect:(CGRect)rect{ UIBezierPath *rounded = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:radii]; CAShapeLayer *shape = [[CAShapeLayer alloc] init]; [shape setPath:rounded.CGPath]; self.layer.mask = shape;}@end |
使用方法以UIImageView为例
UIImage
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[image addRoundedCorners:UIRectCornerTopLeft|UIRectCornerTopRight withRadii:CGSizeMake(20.0, 20.0)]; |
将颜色转为图片
UIImage
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-(UIImage *)ImageForColor:(UIColor *)color{ CGRect rect = CGRectMake(0.0f, 0.0f, 10, 10); UIGraphicsBeginImageContext(rect.size); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetFillColorWithColor(context, [color CGColor]); CGContextFillRect(context, rect); UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image;} |
图片添加系统滤镜
UIImage
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-(UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur { CIContext *context = [CIContext contextWithOptions:nil]; CIImage *inputImage = [CIImage imageWithCGImage:image.CGImage]; CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur" keysAndValues:kCIInputImageKey, inputImage, @"inputRadius", @(blur), nil]; CIImage *outputImage = filter.outputImage; CGImageRef outImage = [context createCGImage:outputImage fromRect:[outputImage extent]]; return [UIImage imageWithCGImage:outImage];} |
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对服务器之家的支持。
原文链接：http://blog.duicode.com/2419.html
