分享類型：應用開發相關
ios圖片加水印或文字
詳情可見附件，我親自測試了一下，發現原來的方法確實存在諸多問題，重新寫了一下，大家隨意取用，有問題再交流
1.加文字
- (UIImage *)imageWithLogoText:(UIImage *)img text:(NSString*)text1
{
/////注：此為后來更改，用于顯示中文。zyq,2013-5-8
CGSize size = CGSizeMake(200, img.size.height);//設置上下文（畫布）大小
UIGraphicsBeginImageContext(size);//創建一個基于位圖的上下文(context)，并將其設置為當前上下文
CGContextRef contextRef = UIGraphicsGetCurrentContext();//獲取當前上下文
CGContextTranslateCTM(contextRef, 0, img.size.height);//畫布的高度
CGContextScaleCTM(contextRef, 1.0, -1.0);//畫布翻轉
CGContextDrawImage(contextRef, CGRectMake(0, 0, img.size.width, img.size.height), [img CGImage]);//在上下文種畫當前圖片
[[UIColor redColor] set];//上下文種的文字屬性
CGContextTranslateCTM(contextRef, 0, img.size.height);
CGContextScaleCTM(contextRef, 1.0, -1.0);
UIFont *font = [UIFont boldSystemFontOfSize:16];
[text1 drawInRect:CGRectMake(0, 0, 200, 80) withFont:font];//此處設置文字顯示的位置
UIImage *targetimg =UIGraphicsGetImageFromCurrentImageContext();//從當前上下文種獲取圖片
UIGraphicsEndImageContext();//移除棧頂的基于當前位圖的圖形上下文。
returntargetimg;
//注：此為原來，不能顯示中文。無用。
//get image width and height
intw = img.size.width;
inth = img.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
//create a graphic context with CGBitmapContextCreate
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGContextSetRGBFillColor(context, 0.0, 1.0, 1.0, 1);
char* text = (char*)[text1 cStringUsingEncoding:NSUnicodeStringEncoding];
CGContextSelectFont(context,"Georgia", 30, kCGEncodingMacRoman);
CGContextSetTextDrawingMode(context, kCGTextFill);
CGContextSetRGBFillColor(context, 255, 0, 0, 1);
CGContextShowTextAtPoint(context, w/2-strlen(text)*5, h/2, text, strlen(text));
//Create image ref from the context
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return[UIImage imageWithCGImage:imageMasked];
}
2.新的添加文字水印的方法一
#pragma mark -也是文字水印
- (UIImage *) imageWithStringWaterMark:(NSString*)markString inRect:(CGRect)rect color:(UIColor *)color font:(UIFont *)font
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)
{
UIGraphicsBeginImageContextWithOptions([selfsize],NO, 0.0);// 0.0 for scale means "scale for device's main screen".
}
#else
if([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)
{
UIGraphicsBeginImageContext([selfsize]);
}
#endif
//原圖
[selfdrawInRect:CGRectMake(0, 0,self.size.width,self.size.height)];
//文字顏色
[color set];
//水印文字
[markString drawInRect:rect withFont:font];
UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnnewPic;
}
3.還是添加文字水印方法二
#pragma mark -還是文字水印
- (UIImage *) imageWithStringWaterMark:(NSString*)markString atPoint:(CGPoint)point color:(UIColor *)color font:(UIFont *)font
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)
{
UIGraphicsBeginImageContextWithOptions([selfsize],NO, 0.0);// 0.0 for scale means "scale for device's main screen".
}
#else
if([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)
{
UIGraphicsBeginImageContext([selfsize]);
}
#endif
//原圖
[selfdrawInRect:CGRectMake(0, 0,self.size.width,self.size.height)];
//文字顏色
[color set];
//水印文字
[markString drawAtPoint:point withFont:font];
UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnnewPic;
}
4.加圖片
#pragma mark - 加圖片水印
-(UIImage *)imageWithLogoImage:(UIImage *)img logo:(UIImage *)logo
{
//get image width and height
intw = img.size.width;
inth = img.size.height;
intlogoWidth = logo.size.width;
intlogoHeight = logo.size.height;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
//create a graphic context with CGBitmapContextCreate
CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
CGContextDrawImage(context, CGRectMake(w-logoWidth, 0, logoWidth, logoHeight), [logo CGImage]);
CGImageRef imageMasked = CGBitmapContextCreateImage(context);
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
return[UIImage imageWithCGImage:imageMasked];
//??CGContextDrawImage(contextRef, CGRectMake(100, 50, 200, 80), [smallImg CGImage]);
}
5.新的添加圖片水印的方法
#pragma mark -還是圖片水印
- (UIImage *) imageWithWaterMask:(UIImage*)mask inRect:(CGRect)rect
{
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)
{
UIGraphicsBeginImageContextWithOptions([selfsize],NO, 0.0);// 0.0 for scale means "scale for device's main screen".
}
#else
if([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)
{
UIGraphicsBeginImageContext([selfsize]);
}
#endif
//原圖
[selfdrawInRect:CGRectMake(0, 0,self.size.width,self.size.height)];
//水印圖
[mask drawInRect:rect];
UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnnewPic;
}
6 .加半透明的水印
//加半透明的水印
-(UIImage *)imageWithTransImage:(UIImage *)useImage addtransparentImage:(UIImage *)transparentimg
{
UIGraphicsBeginImageContext(useImage.size);
[useImage drawInRect:CGRectMake(0, 0, useImage.size.width, useImage.size.height)];
[transparentimg drawInRect:CGRectMake(0, useImage.size.height-transparentimg.size.height, transparentimg.size.width, transparentimg.size.height) blendMode:kCGBlendModeOverlay alpha:0.4f];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
returnresultingImage;
}
下載的工具類：https://app.yinxiang.com/shard/s70/nl/2147483647/dda44123-65db-4b33-a69d-7c4b4dbf0575/
