iOS设置用户头像（从相册，图库或者拍照获取）

①初始化UIImagePickerController

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

 ②遵守协议

@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>

③

//设置代理  
_imagePicker.delegate=self;

   //可编辑

   _imagePicker.allowsEditing=YES;

④

   //设置头像图片圆角

    _selectedRightImage.layer.cornerRadius=100;
    _selectedRightImage.layer.borderWidth=6;
    _selectedRightImage.layer.masksToBounds=YES;
    _selectedRightImage.layer.borderColor=[[UIColor whiteColor] CGColor];
    self.selectedRightImage.userInteractionEnabled=YES;

⑤给图片添加点击事件

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

⑥从相册，图库，相机获取图片

-(void)selectedImageForIcon
{

    UIAlertController *alertController=[UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];
    UIAlertAction *actionCamera=[UIAlertAction actionWithTitle:@"打开相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        _imagePicker.sourceType=UIImagePickerControllerSourceTypeCamera;
        [self presentViewController:_imagePicker animated:YES completion:nil];
        
    }];
    
    UIAlertAction *actionPhotoLIbrary=[UIAlertAction actionWithTitle:@"打开相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        _imagePicker.sourceType=UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentViewController:_imagePicker animated:YES completion:nil];
        
    }];
    
    UIAlertAction *actionPhotoAlbum=[UIAlertAction actionWithTitle:@"打开图库" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        _imagePicker.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum;
        [self presentViewController:_imagePicker animated:YES completion:nil];
        
    }];
    
    UIAlertAction *cancelAction=[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    
    [alertController addAction:actionCamera];
    
    [alertController addAction:actionPhotoAlbum];
    
    [alertController addAction:actionPhotoLIbrary];
    
    [alertController addAction:cancelAction];
    
    [self presentViewController:alertController animated:YES completion:nil];

}

 
实现这个方法就可以更换头像了！！！

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(nullable NSDictionary<NSString *,id> *)editingInfo
{

_selectedRightImage.image=image;
[self dismissViewControllerAnimated:YES completion:nil];

}

最终效果图：