UIActionSheet是处理ios弹出按钮的类，下面我们将使用uialertsheet来实现app的拍照和相册选择功能，先看看UIActionSheet功能实现后的效果，如图。
实现步骤：
1：首先在需要在info.plist内添加手机相册和拍照的权限，添加这两行。
Privacy - Photo Library Usage Description //相册 Privacy - Camera Usage Description //拍照
如图这样添加。
2：在界面添加一个button按钮，并实现UIImagePickerControllerDelegate,UIActionSheetDelegate,UINavigationControllerDelegate这三个代理类。
3：给button添加一个事件，本人是拉线的，然后使用UIActionSheet实现图上面的功能，代码如下。
�#import "ViewController.h"
@interface ViewController ()<UIImagePickerControllerDelegate,UIActionSheetDelegate,UINavigationControllerDelegate>
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
//点击按钮，弹出UIActionSheet提示框
- (IBAction)showUIActionSheet:(UIButton *)sender {
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"添加图片"
delegate:self
cancelButtonTitle:@"取消"
destructiveButtonTitle:nil
otherButtonTitles:@"相册" , @"拍照", nil];
[actionSheet showInView:self.view];
}
#pragma mark - UIActionSheetDelegate 代理方法，点击里面的按钮会设置不同的源
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (2 == buttonIndex) {
return;
}
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
//显示图片的控制器
UIImagePickerController *imgPicker = [[UIImagePickerController alloc] init];
[imgPicker.view setBackgroundColor:[UIColor clearColor]];
[imgPicker setDelegate:self];
if (0 == buttonIndex) { //设置相册源
[imgPicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
} else if (1 == buttonIndex) { //模拟器不能使用相机，会报错，只能真机使用
[imgPicker setSourceType:UIImagePickerControllerSourceTypeCamera];
}
[self presentViewController:imgPicker animated:YES completion:nil];
}];
}
#pragma mark - UIImagePickerControllerDelegate 代理方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[picker dismissViewControllerAnimated:YES completion:nil];
}
//图片选中之后的回调方法，也是代理方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {
[self dismissViewControllerAnimated:YES completion:nil];
//获取相册或拍照的图片对象selectedImg
UIImage *selectedImg = info[UIImagePickerControllerOriginalImage];
//对图片对象进行操作...
}
@end
�完毕！