#import "UIImage+ImageRotate.h"#import <QuartzCore/QuartzCore.h>#import <Accelerate/Accelerate.h>@implementation UIImage (ImageRotate)/** UIImage 任意角度旋转 1 将图片渲染到上下文 context 2 将 context 旋转一定的角度 3 将旋转之后的 context 转化为 UIImage */- (UIImage *)imageRaotateIndegree:(float)degree { // 1 将图片渲染到上下文 context size_t width = (size_t)self.size.width * self.scale; size_t height = (size_t)self.size.height * self.scale; // 每行图片数据字节 size_t bytesPerRow = width * 4; // alpha 通道 CGImageAlphaInfo alphaInfo = kCGImageAlphaPremultipliedFirst; // 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 将 context 旋转一定的角度 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); // 3 将旋转之后的 context 转化为 UIImage CGImageRef rotateImageRef = CGBitmapContextCreateImage(bmContext); UIImage *rotateImage = [UIImage imageWithCGImage:rotateImageRef scale:self.scale orientation:UIImageOrientationUp]; return rotateImage;}@end

#import "UIImage+ImageCut.h"/** 图片任意位置裁剪 */- (UIImage *)imageCutSize:(CGRect)rect { // 1 将需要剪切的部分取出来 CGImageRef subImageRef = CGImageCreateWithImageInRect(self.CGImage, rect); CGRect smallRect = CGRectMake(0, 0, CGImageGetWidth(subImageRef), CGImageGetHeight(subImageRef)); // 2 将图片绘制到上下文中 UIGraphicsBeginImageContext(rect.size); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextDrawImage(context, rect, subImageRef); // 3 将当前上下文保存为UIImage UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image;}@end

#import "UIImage+ImageCircle.h"@interface view: UIView@property (nonatomic, strong) UIImage *image;@end@implementation view- (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSaveGState(context); CGContextAddEllipseInRect(context, CGRectMake(0, 0, rect.size.width, rect.size.height)); CGContextClip(context); CGContextFillPath(context); [_image drawAtPoint:CGPointMake(0, 0)]; CGContextRestoreGState(context);}@end@implementation UIImage (ImageCircle)/** 图片圆角剪切 */- (UIImage *)imageClipCircle { CGFloat imageSizeMin = MIN(self.size.width, self.size.height); CGSize imageSize = CGSizeMake(imageSizeMin, imageSizeMin); view *mView = [[view alloc] init]; mView.image = self; UIGraphicsBeginImageContext(imageSize); CGContextRef context = UIGraphicsGetCurrentContext(); mView.frame = CGRectMake(0, 0, imageSizeMin, imageSizeMin); mView.backgroundColor = [UIColor whiteColor]; [mView.layer renderInContext:context]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image;}@end

#import "UIImage+ImageScale.h"@implementation UIImage (ImageScale)/** 图片任意拉伸 */- (UIImage *)imageScaleSize:(CGSize)size { UIGraphicsBeginImageContext(size); [self drawInRect:CGRectMake(0, 0, size.width, size.height)]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image;}@end

#import "UIView+ImageScreenShot.h"@implementation UIView (ImageScreenShot)/** 屏幕截屏 */- (UIImage *)imageScreenShot { UIGraphicsBeginImageContext(self.frame.size); CGContextRef context = UIGraphicsGetCurrentContext(); [self.layer renderInContext:context]; UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return image;}@end

#import "UIImage+ImageWaterPrint.h"@implementation UIImage (ImageWaterPrint)/** 图片添加文字及logo水印效果 */- (UIImage *)imageWater:(UIImage *)imageLogo waterString:(NSString *)waterString { UIGraphicsBeginImageContext(self.size); // 1 原始图片渲染 [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)]; // 2 将logo渲染到右下角 [imageLogo drawInRect:CGRectMake(self.size.width - 20, self.size.height - 20, 16, 16)]; // 3 将文字渲染到左上角 NSMutableParagraphStyle *paragraphStype = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy]; paragraphStype.lineBreakMode = NSLineBreakByCharWrapping; NSDictionary *dict = @{NSFontAttributeName: [UIFont systemFontOfSize:20], NSForegroundColorAttributeName: [UIColor redColor], NSParagraphStyleAttributeName: paragraphStype}; [waterString drawInRect:CGRectMake(0, 0, 300, 50) withAttributes:dict]; // 4 将当前上下文保存为UIImage UIImage *imageNew = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return imageNew;}@end