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选取图片可以从设备图片库或者从照相机抓取，系统为我们提供的类UIImagePickerController就是一个图像选择器。
UIImagePickerController的主要属性是sourceType,其定义如下
按顺序说明：
UIImagePickerControllerSourceTypePhotoLibrary 为相簿
UIImagePickerControllerSourceTypeCamera 为照相机
UIImagePickerControllerSourceTypeSavedPhotosAlbum 相机胶卷
UIImagePickerController 的委托对象必须实现UINavigationControllerDelegate,UIImagePickerControllerDelegate委托协议，通过其委托对象可以看出其要继承的协议有哪几种，如下图：
UIImagePickerControllerDelegate中定义了两个方法，选择完成时调用的方法和选择取消调用的方法，
如下：
下面直接上代码：
#import <UIKit/UIKit.h> @interface ViewController : UIViewController <UIImagePickerControllerDelegate,UINavigationControllerDelegate> @property (strong, nonatomic) UIImagePickerController *imagePicker; @property (retain, nonatomic) IBOutlet UIImageView *imageView; - (IBAction)pickPhotoLibrary:(id)sender; - (IBAction)pickPhotoCamera:(id)sender; @end
实现文件.m 代码
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)dealloc {
[_imageView release];
[super dealloc];
}
- (IBAction)pickPhotoLibrary:(id)sender {
if (_imagePicker == nil) {
_imagePicker = [[UIImagePickerController alloc] init];
}
_imagePicker.delegate = self;
//数据源类型为相册
_imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
[self presentViewController:_imagePicker animated:YES completion:nil];
}
- (IBAction)pickPhotoCamera:(id)sender {
//判断相机是否可用
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
if (_imagePicker == nil) {
_imagePicker = [[UIImagePickerController alloc] init];
}
_imagePicker.delegate = self;
_imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:_imagePicker animated:YES completion:nil];
} else {
NSLog(@"照相机不可用。");
}
}
- (void) imagePickerControllerDidCancel: (UIImagePickerController *) picker {
_imagePicker.delegate = nil;
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void) imagePickerController: (UIImagePickerController *) picker
didFinishPickingMediaWithInfo: (NSDictionary *) info {
//完成选择后，取出没有被编辑过的图片
UIImage *originalImage = (UIImage *) [info objectForKey:
UIImagePickerControllerOriginalImage];
self.imageView.image = originalImage;
self.imageView.contentMode = UIViewContentModeScaleAspectFill;
_imagePicker.delegate = nil;
[self dismissViewControllerAnimated:YES completion:nil];
}
@end
看一下在真机中的照相机效果图：
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原文地址：http://www.cnblogs.com/tianlin106/p/4561049.html
