OC调用相机并且给拍好的照片添加水印

OC调用相机并且给拍好的照片添加水印

今天我们学习一下iOS调用原生相机并且给照片添加水印要怎么做。

首先我们新建一个项目,在开始写代码之前我们要添加权限。找到项目的Info.plist文件,添加相机和相册的使用权限。右键>Add Row 添加 "Privacy - Photo Library Usage Description" 和 "Privacy - Camera Usage Description"的key。value填写自定义提示文字。(当用户第一次要使用相机和相册的时候会弹出提示框)


1-1

Privacy - Photo Library Usage Description
Privacy - Camera Usage Description

话不多说直接贴代码。

先导入头文件

#import <Photos/Photos.h>
@interface ViewController ()<UIImagePickerControllerDelegate>
@property (strong,nonatomic)  UIImagePickerController * pickerImage;

UIImagePickerController的初始化

self.pickerImage =[[UIImagePickerController alloc] init];
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
        UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;//设置类型为相机
        self.pickerImage.delegate = self;//设置代理
        self.pickerImage.allowsEditing = YES;//设置照片可编辑
        self.pickerImage.sourceType = sourceType;
        //设置是否显示相机控制按钮 默认为YES
        self.pickerImage.showsCameraControls = YES;

        //创建叠加层(例如添加的相框,这里通过这种方式可以在拍照的时候把水印直接显示在相机上) 
        UIView *overLayView=[[UIView alloc]initWithFrame:CGRectMake(0, 60, s_width, s_height - 200)];
        UILabel * telLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 300 - 200, 300, 30)];
        telLbl.textColor = UIColor.whiteColor;
        telLbl.text = [NSString stringWithFormat:@"手机号:%@",self.shouji.text];
        [overLayView addSubview:telLbl];
        UILabel * jingduLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 268 - 200, 300, 30)];
        jingduLbl.text =  [NSString stringWithFormat:@"经度:%@",jingdu] ;
        jingduLbl.textColor = UIColor.whiteColor;
        [overLayView addSubview:jingduLbl];
        UILabel * weiduLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 236 - 200, 300, 30)];
        weiduLbl.text = [NSString stringWithFormat:@"纬度:%@",weidu];
        weiduLbl.textColor = UIColor.whiteColor;
        [overLayView addSubview:weiduLbl];
        UILabel * dizhiLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 202 - 200, 400, 30)];
        dizhiLbl.text = [NSString stringWithFormat:@"地址:%@",dizhi];
        dizhiLbl.textColor = UIColor.whiteColor;
        [overLayView addSubview:dizhiLbl];
        UILabel * shijianLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 170 - 200, 300, 30)];
        shijianLbl.text = [NSString stringWithFormat:@"时间:%@",currentDateStr];
        shijianLbl.textColor = UIColor.whiteColor;
        [overLayView addSubview:shijianLbl];
        UILabel * beizhuLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 138 - 200, 300, 30)];
        beizhuLbl.text = [NSString stringWithFormat:@"备注:%@",self.beizhu.text];;
        beizhuLbl.textColor = UIColor.whiteColor;
        [overLayView addSubview:beizhuLbl];

        //选择前置摄像头或后置摄像头
        self.pickerImage.cameraDevice=UIImagePickerControllerCameraDeviceRear;
        //调用系统摄像头
        [self presentViewController:self.pickerImage animated:YES completion:^{
        }];
        }

拍照以后通过代理方法获取当前得到的图片

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    
    // 获取用户拍摄的是照片还是视频
   UIImage *theImage =nil;
        // 判断,图片是否允许修改
   if ([picker allowsEditing])
   {
       // 获取用户编辑之后的图像
       theImage = [info objectForKey:UIImagePickerControllerEditedImage];
   }
   else
   {
       // 获取原始的照片
       theImage = [info objectForKey:UIImagePickerControllerOriginalImage];
   }
    [self composeImg:theImage];
}

水印简单来说就是两张图片何在一起,我们现在现在来通过UIView画一张图片,把它当做简单的水印,当然大家自己有水印素材可以直接跳过这一步,用两个UIImage对象去合成一张图片

- (void)initLogoImage
{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    //设定时间格式,这里可以设置成自己需要的格式
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    //用[NSDate date]可以获取系统当前时间
    NSString *currentDateStr = [dateFormatter stringFromDate:[NSDate date]];
    //创建叠加层(例如添加的相框)
    UIView *overLayView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, s_width, s_height - 200)];
    UILabel * telLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 300 - 200, 300, 30)];
    telLbl.textColor = UIColor.whiteColor;
    telLbl.text = [NSString stringWithFormat:@"手机:%@",self.shouji.text];
    [overLayView addSubview:telLbl];
    UILabel * jingduLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 268 - 200, 300, 30)];
    jingduLbl.text =  [NSString stringWithFormat:@"经度:%@",jingdu] ;
    jingduLbl.textColor = UIColor.whiteColor;
    [overLayView addSubview:jingduLbl];
    UILabel * weiduLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 236 - 200, 300, 30)];
    weiduLbl.text = [NSString stringWithFormat:@"纬度:%@",weidu];
    weiduLbl.textColor = UIColor.whiteColor;
    [overLayView addSubview:weiduLbl];
    UILabel * dizhiLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 202 - 200, 400, 30)];
    dizhiLbl.text = [NSString stringWithFormat:@"地址:%@",dizhi];
    dizhiLbl.textColor = UIColor.whiteColor;
    [overLayView addSubview:dizhiLbl];
    UILabel * shijianLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 170 - 200, 300, 30)];
    shijianLbl.text = [NSString stringWithFormat:@"时间:%@",currentDateStr];
    shijianLbl.textColor = UIColor.whiteColor;
    [overLayView addSubview:shijianLbl];
    UILabel * beizhuLbl = [[UILabel alloc]initWithFrame:CGRectMake(40, s_height - 138 - 200, 300, 30)];
    beizhuLbl.text = [NSString stringWithFormat:@"备注:%@",self.beizhu.text];
    beizhuLbl.textColor = UIColor.whiteColor;
    [overLayView addSubview:beizhuLbl];
    overLayView.backgroundColor = [UIColor clearColor];
    _logoImage = [self convertViewToImage:overLayView];
}

// 传入UIView生成UIImage对象使用该方法不会模糊,根据屏幕密度计算
- (UIImage *)convertViewToImage:(UIView *)view {
    UIImage *imageRet = [[UIImage alloc]init];
    //UIGraphicsBeginImageContextWithOptions(区域大小, 是否是非透明的, 屏幕密度); 这里透明度指的是背景是否透明
    UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, [UIScreen mainScreen].scale);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    imageRet = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return imageRet;
}

ConvertViewToImage的方法拿到的图片我们把它作为水印和拍好的照片画到一起

// 我这里方法传进来的是主图片 _logoImage是作为水印图片
- (void)composeImg:(UIImage *)image{
    CGFloat w = 1000;
    CGFloat h = 1000;
    //以主图片的大小作为底图
    //以主图片为画布创建上下文
    UIGraphicsBeginImageContext(CGSizeMake(s_width, s_height));
    //先把1.png 画到上下文中
    [image drawInRect:CGRectMake(0, 0, s_width, s_height)];
    //再把小图放在上下文中  位子坐标自己慢慢调整
    [_logoImage drawInRect:CGRectMake(20, 20, w, h)];
    //从当前上下文中获得最终图片
    UIImage *resultImg = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();//关闭上下文
    // 预览我们合成的照片
    [self showResultPhoto:resultImg];
}
    // 预览我们得到的图片 
- (void)showResultPhoto:(UIImage *)image{
    photoImage = [UIImageView new];
    photoImage.image = image;
    [self.view addSubview:photoImage];
    photoImage.frame = self.view.frame;
    saveBtn = [UIButton allloc]initWithFrame:CGRectMake(x, y, width, height)];// 保存图片的按钮
    [saveBtn setTitle:@"使用相片" forState:UIControlStateNormal];
    self.phtotImage = image;
    [saveBtn addTarget:self action:@selector(saveSWPhoto) forControlEvents:UIControlEventTouchUpInside];
    [saveBtn setBackgroundColor:UIColor.grayColor];
    [self.view addSubview:saveBtn];
}
// 保存所得到的图片
- (void)saveSWPhoto{
    ShowHUBInController;
    [[PHPhotoLibrary sharedPhotoLibrary]performChanges:^{
        [PHAssetChangeRequest creationRequestForAssetFromImage:self.phtotImage];
    } completionHandler:^(BOOL success, NSError * _Nullable error) {
        if (error) {
            dispatch_async(dispatch_get_main_queue(), ^{
                HideHUBInController;;
                ShowHUBInWindowAutoHid(@"保存失败");
            });

            NSLog(@"%@",@"保存失败");
            NSLog(@"%@",error);
        } else {
            dispatch_async(dispatch_get_main_queue(), ^{
                HideHUBInController;
                ShowHUBInWindowAutoHid(@"保存成功");
            });
            NSLog(@"%@",@"保存成功");
        }
    }];
}

这里我们来看看软件的截图和拍出的照片的样子吧


打开相机

预览照片

保存到相册的照片

感觉还是不错的,嘿嘿。有什么不好的地方麻烦大家帮忙指出,我们共同学习。
如果能帮到大家,就给我点个赞吧。谢谢大家。

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