iOS图片加水印效果的实现并保存至相册

来源：互联网发布：淘宝商城正品编辑：程序博客网时间：2024/05/20 01:11

图片加水印效果的实现并保存至相册
实现效果如图：
效果图

工程下载：github工程下载链接

代码：

- (void)viewDidLoad {    [super viewDidLoad];    UIImage *image = [UIImage imageNamed:@"pushu.jpg"];    UIImage *waterImage = [self waterMarkImage:image withText:@"朴树水印测试"];    UIImageWriteToSavedPhotosAlbum(waterImage, nil, nil, nil);  //保存图片至相册//    展示图片    UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];    imageView.image = waterImage;    [self.view addSubview:imageView];    // Do any additional setup after loading the view, typically from a nib.}

- (UIImage *)waterMarkImage:(UIImage *)image withText:(NSString *)text {    UIGraphicsBeginImageContext(image.size);//    在画布中绘制内容    [image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];//    绘制文字    [[UIColor darkGrayColor] set];    CGRect rect = CGRectMake(70, 220, 200, 60);    NSDictionary *dic = @{NSFontAttributeName:[UIFont systemFontOfSize:30],                          NSObliquenessAttributeName:@1};       //这里设置了字体，和倾斜度，具体其他参数文章结尾有详细说明的文章链接    [text drawInRect:rect withAttributes:dic];    //在iOS7之前用下列方法比较方便//    [text drawInRect:rect withFont:[UIFont systemFontOfSize:30] lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentCenter];//    从画布中得到image    UIImage *returnImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return returnImage;}

- (void)drawInRect:(CGRect)rect withAttributes:(NSDictionary *)attrs NS_AVAILABLE_IOS(7_0);

关于此方法，在iOS7以后应用，attrs设置参数的详细说明在如下链接文章中：
说明文章链接：attrs参数说明文章

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