iOS中常见的视图和图片处理示例详解

#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

@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

@implementation UIView (imageScreenShot)- (UIImage *)imageScreenShot{ UIGraphicsBeginImageContext(self.frame.size); [self.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *imageNew = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return imageNew;}@end

- (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} 

@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

@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

[image addRoundedCorners:UIRectCornerTopLeft|UIRectCornerTopRight withRadii:CGSizeMake(20.0, 20.0)];

-(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;}

-(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];}