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。
