最近正好專案裡面要整合“開啟照相機與本地相簿選擇圖片”的功能，今天就在這邊給大家寫一個演示程式；開啟相機拍攝後或者在相簿中選擇一張照片，然後將它顯示在介面上。好了廢話不多說，因為比較簡單直接上原始碼。

首先，我們在標頭檔案中新增需要用到的actionSheet控制元件，顯示圖片的UIImageView控制元件，並且加上所需要的協議

#import <UIKit/UIKit.h>

@interface ImagePickerViewController : UIViewController<UIImagePickerControllerDelegate,UIActionSheetDelegate,UINavigationControllerDelegate>

@property (strong, nonatomic) IBOutlet UIImageView *headImage;

@property (strong, nonatomic) UIActionSheet *actionSheet;

- (IBAction)clickPickImage:(id)sender;
@end
 

通過點選我設定在介面中的按鈕來撥出actionSheet控制元件，來選擇相應的操作拍照或是在相簿中選擇相片，程式碼如下：

//
//  ImagePickerViewController.m
//  testAuto
//
//  Created by silicon on 15/5/9.
//  Copyright (c) 2015年 silicon. All rights reserved.
//

#import "ImagePickerViewController.h"

@interface ImagePickerViewController ()

@end

@implementation ImagePickerViewController

@synthesize actionSheet = _actionSheet;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


/**
 @ 呼叫ActionSheet
 */
- (void)callActionSheetFunc{
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
        self.actionSheet = [[UIActionSheet alloc] initWithTitle:@"選擇影象" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"拍照", @"從相簿選擇", nil];
    }else{
        self.actionSheet = [[UIActionSheet alloc] initWithTitle:@"選擇影象" delegate:self cancelButtonTitle:@"取消"destructiveButtonTitle:nil otherButtonTitles:@"從相簿選擇", nil];
    }
    
    self.actionSheet.tag = 1000;
    [self.actionSheet showInView:self.view];
}

// Called when a button is clicked. The view will be automatically dismissed after this call returns
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (actionSheet.tag == 1000) {
        NSUInteger sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        // 判斷是否支援相機
        if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
            switch (buttonIndex) {
                case 0:
                    //來源:相機
                    sourceType = UIImagePickerControllerSourceTypeCamera;
                    break;
                case 1:
                    //來源:相簿
                    sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                    break;
                case 2:
                    return;
            }
        }
        else {
            if (buttonIndex == 2) {
                return;
            } else {
                sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
            }
        }
        // 跳轉到相機或相簿頁面
        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
        imagePickerController.delegate = self;
        imagePickerController.allowsEditing = YES;
        imagePickerController.sourceType = sourceType;
        
        [self presentViewController:imagePickerController animated:YES completion:^{
        
        }];
    }
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissViewControllerAnimated:YES completion:^{
    
    }];
    
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    self.headImage.image = image;
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

- (IBAction)clickPickImage:(id)sender {
    
    [self callActionSheetFunc];
}
@end