iOS获取系统相册中的图片

一.获取单张图片

1.利用UIImagePickerController可以从系统自带的App(照片\相机)中获得图片

2.设置代理,遵守代理协议

  注意:这个UIImagePickerController类比较特殊,需要遵守两个代理协议

<UIImagePickerControllerDelegate><UINavigationControllerDelegate>

代码如下:

@interface ResumeViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>

@property(nonatomic,strong)UIImagePickerController *imagePicker;

@property(nonatomic,strong)UIImageView *photoView;

@property(nonatomic,strong)UIImageView *addImage;

@property(nonatomic,strong)UILabel *photoL;

@end

#pragma mark - 头像访问相册,相机

self.imagePicker = [[UIImagePickerController alloc]init];

self.imagePicker.delegate = self;

self.imagePicker.allowsEditing = YES;

#pragma mark --- 照片

self.photoView = [[UIImageView alloc]init];

self.photoView.backgroundColor = [UIColor whiteColor];

[self.scrollView addSubview:self.photoView];

self.photoView.userInteractionEnabled = YES;

[self.photoView mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(self.scrollView.mas_top);

make.right.equalTo(self.view.mas_right).offset(-5);

make.width.mas_offset(140*ScreenWidth/375);

make.height.mas_offset(46*4*ScreenWidth/375);

}];

self.photoView.layer.borderWidth = 1;

self.photoView.layer.borderColor = [UIColor colorWithHexString:@"#e1e1e1"].CGColor;

//给图片添加点击事件

UITapGestureRecognizer *tapPicture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(selectedImageForIcon)];

[self.photoView addGestureRecognizer:tapPicture];

//

self.addImage = [[UIImageView alloc]init];

[self.photoView addSubview:self.addImage];

self.addImage.image = [UIImage imageNamed:@"填写简历-基本_03"];

self.addImage.userInteractionEnabled = YES;

[self.addImage mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerX.equalTo(self.photoView.mas_centerX);

make.top.equalTo(self.photoView.mas_top).offset(60*ScreenWidth/375);

make.width.mas_offset(20*ScreenWidth/375);

make.height.mas_offset(20*ScreenWidth/375);

}];

self.photoL = [[UILabel alloc]init];

self.photoL.backgroundColor = [UIColor whiteColor];

self.photoL.text = @"添加照片";

self.photoL.font = [UIFont systemFontOfSize:19*ScreenWidth/375];

self.photoL.textColor = [UIColor colorWithHexString:@"#888888"];

[self.photoView addSubview:self.photoL];

[self.photoL mas_makeConstraints:^(MASConstraintMaker *make) {

make.centerX.equalTo(self.photoView.mas_centerX);

make.top.equalTo(self.addImage.mas_bottom).offset(20*ScreenWidth/375);

}];

//从相册,图库,相机获取图片

- (void)selectedImageForIcon{     

   //    NSLog(@"aaaaaaaaaaa");     

   UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"选择方式" message:nil preferredStyle:UIAlertControllerStyleActionSheet];       

 UIAlertAction *actionCamera = [UIAlertAction actionWithTitle:@"打开相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {         

       self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;    

    [self presentViewController:self.imagePicker animated:YES completion:nil];  

  }];    

    UIAlertAction *actionPhotoLibrary = [UIAlertAction actionWithTitle:@"打开相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {                self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;    

    [self presentViewController:self.imagePicker animated:YES completion:nil];

    }];     

   UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];     

   [alertController addAction:actionCamera];  

  [alertController addAction:actionPhotoLibrary]; 

   [alertController addAction:cancelAction];    

[self presentViewController:alertController animated:YES completion:nil];    }

//从相册选择图片后操作

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info{

//获取裁剪后的图片

UIImage *image = info[UIImagePickerControllerEditedImage];

//将照片存到媒体库

UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), NULL);

self.photoView.image = image;

//将照片存到沙盒

[self saveImage:image];

[picker dismissViewControllerAnimated:YES completion:^{

}];

}

//照片存到本地后的回调

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{

if (!error) {

NSLog(@"存储成功");

self.addImage.hidden = YES;

self.photoL.hidden = YES;

}else{

NSLog(@"存储失败:%@",error);

}

}

//保存图片

- (void)saveImage:(UIImage *)currentImage{

//设置照片的品质

NSData *imageData = UIImageJPEGRepresentation(currentImage, 0.5);

NSLog(@"%@",NSHomeDirectory());

//获取沙盒目录

NSString *filePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/currentImage.png"];

//将图片写入文件

[imageData writeToFile:filePath atomically:NO];

}

//取消操作

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{

[picker dismissViewControllerAnimated:YES completion:^{

}];

}

做到这里,运行程序,点击相册或相机会崩溃,是因为没有在info.plist文件中添加这两个,填上就好了

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