1.首先要遵守三个协议

UIActionSheetDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate

2.主要代码

//选择头像
- (IBAction)handleSelectImage:(id)sender {
    self.myActionSheet = [[UIActionSheet alloc]
                    initWithTitle:nil
                    delegate:self
                    cancelButtonTitle:@"取消"
                    destructiveButtonTitle:nil
                    otherButtonTitles:@"打开照相机",@"从相册中获取", nil];
    [self.myActionSheet showInView:self.view];
}
#pragma mark - UIActionSheetDelegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == self.myActionSheet.cancelButtonIndex) {
        NSLog(@"你取消了");
    }
    switch (buttonIndex) {
        case 0:
            [self takePhoto];
            break;
        case 1:
            [self localPhoto];
            break;
        default:
            break;
    }
}
//照相
- (void)takePhoto{
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
    {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        //设置拍照后的图片可被编辑
        picker.allowsEditing = YES;
        picker.sourceType = sourceType;
        [self presentViewController:picker animated:YES completion:nil];
    }else
    {
        NSLog(@"模拟其中无法打开照相机,请在真机中使用");
    }
}
//选取本地图片
- (void)localPhoto{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    picker.delegate = self;
    picker.allowsEditing = YES;
    [self presentViewController:picker animated:YES completion:nil];
}
//当选择一张图片后进入这里
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{
    
    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
    
    //当选择的类型是图片
    if ([type isEqualToString:@"public.image"])
    {
        //先把图片转成NSData
        UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
        NSData *data;
        if (UIImagePNGRepresentation(image) == nil)
        {
            data = http://www.mamicode.com/UIImageJPEGRepresentation(image, 1.0);>
<pre name="code" class="objc">- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    NSLog(@"您取消了选择图片");
    [picker dismissViewControllerAnimated:YES completion:nil];
}



调去系统照相机或者从本地相册获取图片.