iOS中实现imageView任意角度旋转的方法

#import"UIImage+RotateImageTool.h"#import<QuartzCore/QuartzCore.h>#import<Accelerate/Accelerate.h>@implementationUIImage (RotateImageTool)-(UIImage*)rotateImageWithDegree:(CGFloat)degree{//将image转化成context//获取图片像素的宽和高size_t width =self.size.width*self.scale;size_t height =self.size.height*self.scale;//颜色通道为8因为0-255经过了8个颜色通道的变化//每一行图片的字节数因为我们采用的是ARGB/RGBA所以字节数为width * 4size_t bytesPerRow =width *4;//图片的透明度通道CGImageAlphaInfo info =kCGImageAlphaPremultipliedFirst;//配置context的参数:CGContextRef context =CGBitmapContextCreate(nil, width, height,8, bytesPerRow,CGColorSpaceCreateDeviceRGB(),kCGBitmapByteOrderDefault|info);if(!context) {return nil;}//将图片渲染到图形上下文中CGContextDrawImage(context,CGRectMake(0,0, width, height),self.CGImage);uint8_t* data = (uint8_t*)CGBitmapContextGetData(context);//旋转欠的数据vImage_Buffer src = { data,height,width,bytesPerRow};//旋转后的数据vImage_Buffer dest= { data,height,width,bytesPerRow};//背景颜色Pixel_8888 backColor = {0,0,0,0};//填充颜色vImage_Flags flags = kvImageBackgroundColorFill;//旋转context vImageRotate_ARGB8888(&src, &dest,nil, degree *M_PI/180.f, backColor, flags);//将conetxt转换成imageCGImageRef imageRef =CGBitmapContextCreateImage(context);UIImage* rotateImage =[UIImageimageWithCGImage:imageRefscale:self.scaleorientation:self.imageOrientation];returnrotateImage;}

// retina屏幕图片显示问题[_detailImageView setContentScaleFactor:[[UIScreen mainScreen] scale]];// 不规则图片显示_detailImageView.contentMode = UIViewContentModeScaleAspectFill;_detailImageView.autoresizingMask = UIViewAutoresizingFlexibleHeight;// 图片大于或小于显示区域_detailImageView.clipsToBounds = YES;