ios圖片加水印或文字

時間 2019-11-21

標籤 ios 圖片水印文字欄目 iOS 简体版

原文原文鏈接

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，從新寫了一下，你們隨意取用，有問題再交流
發一張截圖

原帖：[url]~~http://hi.baidu.com/peter_wwj/item/179cbe060c570e873c42e298~~[/url]
1.加文字ios

?測試

1url

2spa

3code

4blog

5圖片

6ip

7ci

8rem

- (UIImage *)imageWithLogoText:(UIImage *)img text:(NSString *)text1

{

/////注：此爲後來更改，用於顯示中文。zyq,2013-5-8

CGSize size = CGSizeMake(200, img.size.height); //設置上下文（畫布）大小

UIGraphicsBeginImageContext(size); //建立一個基於位圖的上下文(context)，並將其設置爲當前上下文

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(); //移除棧頂的基於當前位圖的圖形上下文。

return targetimg;

//注：此爲原來，不能顯示中文。無用。

//get image width and height

int w = img.size.width;

int h = 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([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".

}

#else

if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)

{

UIGraphicsBeginImageContext([self size]);

}

#endif

//原圖

[self drawInRect: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();

return newPic;

}

3.仍是添加文字水印方法二

#pragma mark -仍是文字水印

- (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([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".

}

#else

if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)

{

UIGraphicsBeginImageContext([self size]);

}

#endif

//原圖

[self drawInRect: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();

return newPic;

}

4.加圖片

#pragma mark - 加圖片水印

-(UIImage *)imageWithLogoImage:(UIImage *)img logo:(UIImage *)logo

{

//get image width and height

int w = img.size.width;

int h = img.size.height;

int logoWidth = logo.size.width;

int logoHeight = 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 -仍是圖片水印

- (UIImage *) imageWithWaterMask:(UIImage*)mask inRect:(CGRect)rect

{

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4.0)

{

UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".

}

#else

if ([[[UIDevice currentDevice] systemVersion] floatValue] < 4.0)

{

UIGraphicsBeginImageContext([self size]);

}

#endif

//原圖

[self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];

//水印圖

[mask drawInRect:rect];

UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return newPic;

}

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();

return resultingImage;

}