UIImagePickerController 是系统提供的用来获取图片和视频的接口;
用UIImagePickerController 类来获取图片视频,大体分为以下几个步骤:
1. 初始化UIImagePickerController 类;
2. 设置UIImagePickerController 实例的数据来源类型(下面解释);
3. 设置设置代理;
4. 如果需要做图片修改的话设置allowsEditing =yes。
数据来源类型一共有三种:
enum {
UIImagePickerControllerSourceTypePhotoLibrary ,//来自图库
UIImagePickerControllerSourceTypeCamera ,//来自相机
UIImagePickerControllerSourceTypeSavedPhotosAlbum //来自相册
};
在用这些来源的时候最好检测以下设备是否支持;
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
{
NSLog(@"支持相机");
}
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])
{
NSLog(@"支持图库");
}
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
NSLog(@"支持相片库");
}
调用摄像头来获取资源
- (void)viewDidLoad {
[super viewDidLoad];
// 初始化系统相册界面的VC.
picker = [[UIImagePickerController alloc]init];
// 设置VC的相关属性.
picker.view.backgroundColor = [UIColor orangeColor];
// 选择相片的来源类型(相机,图库,照片库).
UIImagePickerControllerSourceType sourcheType = UIImagePickerControllerSourceTypeCamera;
picker.sourceType = sourcheType;
picker.delegate = self;
picker.allowsEditing = YES;
}
模态推出 UIImagePickerController相册界面
[self presentViewController:picker animated:YES completion:nil];
UIImagePickerControllerDelegate 代理方法 (用来获取选中或者取消图片)
// chose选中某张图片,内含参数info,图片的信息.(选中后调用此方法)
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary
*)info {
在这里面我们可以拿到我们想要的图片,
然后回到原始界面dismiss该VC.
}
// 取消的时候调用此方法.
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;
// 已弃用.
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info;
选取的信息都在info中,info 是一个字典。
字典中的键:
NSString *const UIImagePickerControllerMediaType ;指定用户选择的媒体类型(文章最后进行扩展)
NSString *const UIImagePickerControllerOriginalImage ;原始图片
NSString *const UIImagePickerControllerEditedImage ;修改后的图片
NSString *const UIImagePickerControllerCropRect ;裁剪尺寸
NSString *const UIImagePickerControllerMediaURL ;媒体的URL
NSString *const UIImagePickerControllerReferenceURL ;原件的URL
NSString *const UIImagePickerControllerMediaMetadata;当来数据来源是照相机的时候这个值才有效
UIImagePickerController 的更多参数参考这里。
UIImagePickerControllerMediaType 包含着KUTTypeImage 和KUTTypeMovie.
KUTTypeImage 包含:
const CFStringRef kUTTypeImage ;抽象的图片类型
const CFStringRef kUTTypeJPEG ;
const CFStringRef kUTTypeJPEG2000 ;
const CFStringRef kUTTypeTIFF ;
const CFStringRef kUTTypePICT ;
const CFStringRef kUTTypeGIF ;
const CFStringRef kUTTypePNG ;
const CFStringRef kUTTypeQuickTimeImage ;
const CFStringRef kUTTypeAppleICNS
const CFStringRef kUTTypeBMP;
const CFStringRef kUTTypeICO;
KUTTypeMovie 包含:
const CFStringRef kUTTypeAudiovisualContent ;抽象的声音视频
const CFStringRef kUTTypeMovie ;抽象的媒体格式(声音和视频)
const CFStringRef kUTTypeVideo ;只有视频没有声音
const CFStringRef kUTTypeAudio ;只有声音没有视频
const CFStringRef kUTTypeQuickTimeMovie ;
const CFStringRef kUTTypeMPEG ;
const CFStringRef kUTTypeMPEG4 ;
const CFStringRef kUTTypeMP3 ;
const CFStringRef kUTTypeMPEG4Audio ;
const CFStringRef kUTTypeAppleProtectedMPEG4Audio;
另外可以再研究研究PhoneKit框架.详解链接:http://kayosite.com/ios-development-and-detail-of-photo-framework-part-two.html