添加水印logo和文字 iOS

来源：互联网发布：安卓鼓机软件loopz 编辑：程序博客网时间：2024/05/01 04:29

创建一个category文件

#import <UIKit/UIKit.h>

@interface UIImage (ImageWaterPrint)
-(UIImage *)imageWater:(UIImage *)imageLogo waterString:(NSString*)waterString;
@end

#import "UIImage+ImageWaterPrint.h"

@implementation UIImage (ImageWaterPrint)
-(UIImage *)imageWater:(UIImage *)imageLogo waterString:(NSString*)waterString{
    UIGraphicsBeginImageContext(self.size);
    //原始图片渲染
    [self drawInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
    CGFloat waterX = 633;
    CGFloat waterY = 461;
    CGFloat waterW = 16;
    CGFloat waterH = 16;
    //logo的渲染
    [imageLogo drawInRect:CGRectMake(waterX, waterY, waterW, waterH)];

    //渲染文字
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle defaultParagraphStyle]mutableCopy];
    paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
    NSDictionary *dic = @{NSFontAttributeName:[UIFont systemFontOfSize:20],NSParagraphStyleAttributeName:paragraphStyle,NSForegroundColorAttributeName:[UIColor redColor]};
    [waterString drawInRect:CGRectMake(0, 0, 300, 60) withAttributes:dic];

    UIImage *imageNew = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext(); // 此处注意要最后写入关闭绘制
    return imageNew;
}
@end

ViewController中

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [self imageWaterPrint];

}

-(void)imageWaterPrint{
    UIImage *image = [UIImage imageNamed:@"1"];
    UIImage *imageLogo =[UIImage imageNamed:@"2"];
    UIImage *imageNew =[image imageWater:imageLogo waterString:@"哲"];
    UIImageWriteToSavedPhotosAlbum(imageNew, nil, nil, nil); // 将图片保存到手机相册中
}

@end

添加 <key>NSPhotoLibraryUsageDescription</key> <string>App需要您的同意,才能访问相册</string> iOS 10如果访问必须添加否则闪退

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