写个分类 UIImage+extension.h
//给图片添加文字
+ (UIImage*)waterImageWithImage:(UIImage*)image text:(NSString*)text textPoint:(CGPoint)point attributedString:(NSDictionary* )attributed;
//给图片添加logo
+ (UIImage*)waterImageWithImage:(UIImage*)image waterImage:(UIImage*)waterImage waterImageRect:(CGRect)rect;
// 给图片添加文字水印：
+ (UIImage*)waterImageWithImage:(UIImage*)image text:(NSString*)text textPoint:(CGPoint)point attributedString:(NSDictionary* )attributed{
//1.开启上下文
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
//2.绘制图片
[imagedrawInRect:CGRectMake(0,0, image.size.width, image.size.height)];
//添加水印文字
[textdrawAtPoint:pointwithAttributes:attributed];
//3.从上下文中获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//4.关闭图形上下文
UIGraphicsEndImageContext();
//返回图片
returnnewImage;
}
// 给图片添加图片水印
+ (UIImage*)waterImageWithImage:(UIImage*)image waterImage:(UIImage*)waterImage waterImageRect:(CGRect)rect{
//1.获取图片
//2.开启上下文
UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
//3.绘制背景图片
[imagedrawInRect:CGRectMake(0,0, image.size.width, image.size.height)];
//绘制水印图片到当前上下文
[waterImagedrawInRect:rect];
//4.从上下文中获取新图片
UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
//5.关闭图形上下文
UIGraphicsEndImageContext();
//返回图片
returnnewImage;
}
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在viewController 中使用
-(UIImageView*)imageview
{
if(!_imageview) {
_imageview = [[UIImageView alloc]initWithFrame:CGRectMake(0, 100, 400, 400)];
UIImage * image = [UIImage imageNamed:@"20160719120225_fTS4H.thumb.700_0.png.jpeg"];
image = [UIImagewaterImageWithImage:imagetext:@"超级大美女"textPoint:CGPointMake(100,100)attributedString:@{NSForegroundColorAttributeName:[UIColorredColor],NSFontAttributeName:[UIFontsystemFontOfSize:100]}];
image = [UIImage waterImageWithImage:image waterImage:[UIImage imageNamed:@"logo.png"] waterImageRect:CGRectMake(50, 50, 150, 50)];
_imageview.image= image;
}
return _imageview;
}
- (void)viewDidLoad {
[super viewDidLoad];
[self.viewaddSubview:self.imageview];
}
