在平时使用手机的时候，有时会需要一张图片(比如设置头像的时候)，这时我们就需要选择相机拍照，还是在相册中选择，下面就介绍这个方法

在 .h 文件中

#import 
    
     @interface ViewController : UIViewController
     
      {        //新建一个图片选择器（相机或相册），并且添加代理    UIImagePickerController *myImagePicker;}@end
     
    

在 .m 文件中

#import "ViewController.h"@interface ViewController (){        //新建一个图片界面，用来显示我们选择的图片    UIImageView *myImageView;}@end@implementation ViewController{        //无符号整型    NSUInteger *sourceType;    }- (void)viewDidLoad {    [super viewDidLoad];    //设置图片界面的位置和大小,并添加到界面上    myImageView = [[UIImageView alloc]initWithFrame:CGRectMake(50, 300, self.view.frame.size.width-100, 300)];    myImageView.backgroundColor = [UIColor redColor];    [self.view addSubview:myImageView];        //新建一个Button，点击后选择相机还是相册    UIButton *myButton = [[UIButton alloc]initWithFrame:CGRectMake(100, 50, 200, 40)];    myButton.backgroundColor = [UIColor grayColor];    [myButton setTitle:@"添加图片" forState:UIControlStateNormal];    [myButton addTarget:self action:@selector(haha:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:myButton];     }//Button的方法-(void)haha:(id)sender{        [self tagmuxh:nil];    }-(void)tagmuxh:(id)sender{        //新建一个底部弹框（这里用的是旧办法）    UIActionSheet *sheet;        //判断是否支持相机，并且设置相应的弹出框内容    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {                sheet = [[UIActionSheet alloc]initWithTitle:@"选择" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"拍照",@"从相册选择", nil];            }else{                sheet = [[UIActionSheet alloc]initWithTitle:@"选择" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"取消" otherButtonTitles:@"从相册选择", nil];      }        sheet.tag = 110;        [sheet showInView:self.view];    }-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{        if (actionSheet.tag == 110) {        sourceType = 0;                //判断是否支持相机        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {            switch (buttonIndex) {                case 0:                    //取消                    return;                case 1:                    //相机                    sourceType = UIImagePickerControllerSourceTypeCamera;                    break;                case 2:                    //相册                    sourceType = UIImagePickerControllerSourceTypePhotoLibrary;                    break;                                }        }else{                        if (buttonIndex == 0) {                return;            }else{                sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;                            }                    }                //跳转到相机或相册页面        [self performSelector:@selector(showcamera:) withObject:nil afterDelay:0.3];    } }-(void)showcamera:(id)sender{        myImagePicker = [[UIImagePickerController alloc]init];        myImagePicker.delegate = self;        myImagePicker.allowsImageEditing = YES;        myImagePicker.sourceType = sourceType;        [self presentViewController:myImagePicker animated:YES completion:NULL]; }-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary
    
      *)info{        [picker dismissViewControllerAnimated:YES completion:^{}];        NSLog(@"info%@", info);        UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];        //给文件起名    NSString *stringtag = @"nihao";        //保存Image    [self saveImage:image withName:stringtag];        NSString *filePath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents" ] stringByAppendingPathComponent:stringtag];    NSLog(@"%@", filePath);        //显示imageView    UIImage *saveImage = [[UIImage alloc]initWithContentsOfFile:filePath];        myImageView.image = saveImage;    }//保存图片到沙盒文件-(void)saveImage:(UIImage *)currentImage withName:(NSString *)imageName{        NSData *imageData = UIImageJPEGRepresentation(currentImage, 0.5);        //获取沙盒目录    NSString *filePath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]stringByAppendingPathComponent:imageName];        //将图片写入文件    [imageData writeToFile:filePath atomically:NO];    }