Quartz 2D 实例：Watermark

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Quartz 2D 实例：Watermark

分类：Quartz-2D类目

UIImage+Watermark.h

(Watermark)- (UIImage *)watermarkImageWithText:(NSString *)text;@end

UIImage+Watermark.m

(Watermark)- (UIImage *)watermarkImageWithText:(NSString *)text{//1.取到上下文UIGraphicsBeginImageContext(self.size);//2.绘制图片[, )];- , 30);NSMutableParagraphStyle *style = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];style.alignment = NSTextAlignmentCenter;NSDictionary *attr = @{NSFontAttributeName: [UIFont boldSystemFontOfSize:25],NSParagraphStyleAttributeName: style,NSForegroundColorAttributeName: [UIColor whiteColor]};// [[UIColor whiteColor] set];[text drawInRect:textRect withAttributes:attr];//4.获取到绘制完成的图片UIImage *watermarkedImage = UIGraphicsGetImageFromCurrentImageContext();//5.结束在图片上的绘制UIGraphicsEndImageContext();return watermarkedImage;}@end

ViewController.m

()- (void)viewDidLoad {[super viewDidLoad];//水印UIImage *originImage = [UIImage imageNamed:@”屏幕快照 2015-04-04 16.21.17.png”];UIImage *watermarkedImage = [originImage watermarkImageWithText:@”Mainning.blog”];UIImageView *imgView = [[UIImageView alloc] initWithImage:watermarkedImage];imgView;[self.view addSubview:imgView];}@end

上一篇Quartz 2D绘图基本用法下一篇autoresizingMask

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