最近整理了图片常用处理的一些方法，包括
/**
改变图片透明度
@param alpha 透明度 0.0~1.0
@return 已改变透明度的图片
*/
- (UIImage *)sa_imageWithAlpha:(CGFloat)alpha;
/**
任意改变图片尺寸
@param size 需要的图片尺寸
@return 已改变尺寸的图片
*/
- (UIImage *)sa_imageWithSize:(CGSize)size;
/**
等比例放缩图片
@param scale 放缩图片比例
@return 已放缩后的图片
*/
- (UIImage *)sa_imageStretchWithScale:(CGFloat)scale;
/**
裁剪图片 用贝塞尔曲线画图根据实际操作 这里仅提供常用类型裁剪
@param rect 在原图片的基础上裁剪图片的rect
@param style 裁剪图片风格
@return 裁剪出来的图片
*/
- (UIImage *)sa_imageClipWithRect:(CGRect)rect andStyle:(ImageClipStyle)style;
/**
图片压缩（质量）
@param ratio 压缩比例0.0~1.0
@return 质量压缩后的：图片数据流
*/
- (NSData *)sa_imageCompressReturnDataWithRatio:(CGFloat)ratio;
/**
图片压缩（质量）
@param ratio ratio 压缩比例0.0~1.0
@return 质量压缩后的：图片
*/
- (UIImage *)sa_imageCompressReturnImageWithRatio:(CGFloat)ratio;
/**
图片模糊
@param level 模糊级别0.0~1.0
@return 模糊处理后的图片
*/
- (UIImage *)sa_imageBlurWithLevel:(CGFloat)level;
/**
图片旋转
@param orientation 在原图片基础上旋转方向：左、右、下
@return 旋转后的图片
*/
- (UIImage *)sa_imageRotateWithOrientation:(UIImageOrientation)orientation;
/**
将UIView转化成图片
放到这里有点不合适，应该放UIView的category里面，放这里暂时用着
@param theView 需要转化的UIView
@return UIView的图片
*/
- (UIImage *)sa_getImageFromView:(UIView *)theView;
/**
两张图片叠加、合成
@param rect 本身图片对于合成图片的rect
@param anotherImage 图片2
@param anotherRect 图片2对于合成图片的rect
@param size 合成图片的size
@return 合成的图片
*/
- (UIImage *)sa_integrateImageWithRect:(CGRect)rect
andAnotherImage:(UIImage *)anotherImage
anotherImageRect:(CGRect)anotherRect
integratedImageSize:(CGSize)size;
/**
图片添加水印
@param markImage 水印图片
@param imgRect 水印图片对于原图片的rect
@param alpha 水印图片透明度
@param markStr 水印文字
@param strRect 水印文字对于原图片的rect
@param attribute 水印文字的设置颜色、字体大小
@return 添加水印后的图片
*/
- (UIImage *)sa_imageWaterMark:(UIImage *)markImage
imageRect:(CGRect)imgRect
markImageAlpha:(CGFloat)alpha
markString:(NSString *)markStr
stringRect:(CGRect)strRect
stringAttribute:(NSDictionary *)attribute;
@end
方法实现：
- (UIImage *)sa_imageWithAlpha:(CGFloat)alpha {
if (alpha>1.0) {
alpha = 1.0;
}
if (alpha<=0.0) {
alpha = 0.0;
}
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGRect area = CGRectMake(0, 0, self.size.width, self.size.height);
CGContextScaleCTM(ctx, 1, -1);
CGContextTranslateCTM(ctx, 0, -area.size.height);
CGContextSetBlendMode(ctx, kCGBlendModeMultiply);
CGContextSetAlpha(ctx, alpha);
CGContextDrawImage(ctx, area, self.CGImage);
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
- (UIImage *)sa_imageWithSize:(CGSize)size {
UIGraphicsBeginImageContext(CGSizeMake(size.width, size.height));
[self drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIImage *resizedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resizedImage;
}
- (UIImage *)sa_imageStretchWithScale:(CGFloat)scale {
UIGraphicsBeginImageContext(CGSizeMake(self.size.width * scale, self.size.height * scale));
[self drawInRect:CGRectMake(0, 0, self.size.width * scale, self.size.height * scale)];
UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return scaledImage;
}
- (UIImage *)sa_imageClipWithRect:(CGRect)rect andStyle:(ImageClipStyle)style {
UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
UIBezierPath *path;
switch (style) {
case ImageClipRectStyle:path = [UIBezierPath bezierPathWithRect:rect];
break;
case ImageClipOvalStyle:path = [UIBezierPath bezierPathWithOvalInRect:rect];
break;
default:
break;
}
[path addClip];
[self drawAtPoint:CGPointZero];
UIImage *circleImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return circleImage;
}
- (NSData *)sa_imageCompressReturnDataWithRatio:(CGFloat)ratio {
//UIImageJPEGRepresentation和UIImagePNGRepresentation
if (ratio>1.0) {
ratio = 1.0;
}
if (ratio<=0) {
ratio = 0.0;
}
NSData *compressedData = UIImageJPEGRepresentation(self, ratio);
return compressedData;
}
- (UIImage *)sa_imageCompressReturnImageWithRatio:(CGFloat)ratio {
//UIImageJPEGRepresentation和UIImagePNGRepresentation
if (ratio>1.0) {
ratio = 1.0;
}
if (ratio<=0) {
ratio = 0.0;
}
NSData *compressedData = UIImageJPEGRepresentation(self, ratio);
UIImage *compressedImage = [UIImage imageWithData:compressedData];
return compressedImage;
}
- (UIImage *)sa_imageBlurWithLevel:(CGFloat)level {
if (level>1.0) {
level = 1.0;
}
if (level<=0) {
level = 0.0;
}
int boxSize = (int)(level * 100);
boxSize = boxSize - (boxSize % 2) + 1;
CGImageRef img = self.CGImage;
vImage_Buffer inBuffer, outBuffer;
vImage_Error error;
void *pixelBuffer;
CGDataProviderRef inProvider = CGImageGetDataProvider(img);
CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);
inBuffer.width = CGImageGetWidth(img);
inBuffer.height = CGImageGetHeight(img);
inBuffer.rowBytes = CGImageGetBytesPerRow(img);
inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);
pixelBuffer = malloc(CGImageGetBytesPerRow(img) *
CGImageGetHeight(img));
if(pixelBuffer == NULL)
outBuffer.data = pixelBuffer;
outBuffer.width = CGImageGetWidth(img);
outBuffer.height = CGImageGetHeight(img);
outBuffer.rowBytes = CGImageGetBytesPerRow(img);
error = vImageBoxConvolve_ARGB8888(&inBuffer,
&outBuffer,
NULL,
0,
0,
boxSize,
boxSize,
NULL,
kvImageEdgeExtend);
if (error) {
}
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(
outBuffer.data,
outBuffer.width,
outBuffer.height,
8,
outBuffer.rowBytes,
colorSpace,
kCGImageAlphaNoneSkipLast);
CGImageRef imageRef = CGBitmapContextCreateImage (ctx);
UIImage *returnImage = [UIImage imageWithCGImage:imageRef];
//clean up
CGContextRelease(ctx);
CGColorSpaceRelease(colorSpace);
free(pixelBuffer);
CFRelease(inBitmapData);
CGColorSpaceRelease(colorSpace);
CGImageRelease(imageRef);
return returnImage;
}
- (UIImage *)sa_imageRotateWithOrientation:(UIImageOrientation)orientation {
long double rotate = 0.0;
CGRect rect;
float translateX = 0;
float translateY = 0;
float scaleX = 1.0;
float scaleY = 1.0;
switch (orientation) {
case UIImageOrientationLeft:
rotate = M_PI_2;
rect = CGRectMake(0, 0, self.size.height, self.size.width);
translateX = 0;
translateY = -rect.size.width;
scaleY = rect.size.width/rect.size.height;
scaleX = rect.size.height/rect.size.width;
break;
case UIImageOrientationRight:
rotate = 3 * M_PI_2;
rect = CGRectMake(0, 0, self.size.height, self.size.width);
translateX = -rect.size.height;
translateY = 0;
scaleY = rect.size.width/rect.size.height;
scaleX = rect.size.height/rect.size.width;
break;
case UIImageOrientationDown:
rotate = M_PI;
rect = CGRectMake(0, 0, self.size.width, self.size.height);
translateX = -rect.size.width;
translateY = -rect.size.height;
break;
default:
rotate = 0.0;
rect = CGRectMake(0, 0, self.size.width, self.size.height);
translateX = 0;
translateY = 0;
break;
}
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
//做CTM变换
CGContextTranslateCTM(context, 0.0, rect.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
CGContextRotateCTM(context, rotate);
CGContextTranslateCTM(context, translateX, translateY);
CGContextScaleCTM(context, scaleX, scaleY);
//绘制图片
CGContextDrawImage(context, CGRectMake(0, 0, rect.size.width, rect.size.height), self.CGImage);
UIImage *rotatedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return rotatedImage;
}
- (UIImage *)sa_getImageFromView:(UIView *)theView {
UIGraphicsBeginImageContextWithOptions(theView.bounds.size, YES, theView.layer.contentsScale);
[theView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
- (UIImage *)sa_integrateImageWithRect:(CGRect)rect
andAnotherImage:(UIImage *)anotherImage
anotherImageRect:(CGRect)anotherRect
integratedImageSize:(CGSize)size
{
UIGraphicsBeginImageContext(size);
[self drawInRect:rect];
[anotherImage drawInRect:anotherRect];
UIImage *integratedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return integratedImage;
}
- (UIImage *)sa_imageWaterMark:(UIImage *)markImage
imageRect:(CGRect)imgRect
markImageAlpha:(CGFloat)alpha
markString:(NSString *)markStr
stringRect:(CGRect)strRect
stringAttribute:(NSDictionary *)attribute{
UIGraphicsBeginImageContext(self.size);
[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height) blendMode:kCGBlendModeNormal alpha:1.0];
if (markImage) {
[markImage drawInRect:imgRect blendMode:kCGBlendModeNormal alpha:alpha];
}
if (markStr) {
//UILabel convert to UIImage
UILabel *markStrLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, strRect.size.width, strRect.size.height)];
markStrLabel.textAlignment = NSTextAlignmentCenter;
markStrLabel.numberOfLines = 0;
markStrLabel.attributedText = [[NSAttributedString alloc] initWithString:markStr attributes:attribute];
UIImage *image = [self sa_getImageFromView:markStrLabel];
[image drawInRect:strRect blendMode:kCGBlendModeNormal alpha:1.0];;
}
UIImage *waterMarkedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return waterMarkedImage;
}
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