【iPhone】UIImagePickerController 查看图片，视频，录像
UIImagePickerController
－－ the only sanctioned way to get videos/movies or images/pictures on supported devices
<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
用UIImagePickerController选择、显示图片或视频，主要注意UIImagePickerController几个属性的设置
一：UI 显示样式，显示的格式确定
1：sourceType
@property(nonatomic) UIImagePickerControllerSourceType sourceType
enum {
UIImagePickerControllerSourceTypePhotoLibrary,
UIImagePickerControllerSourceTypeCamera,
UIImagePickerControllerSourceTypeSavedPhotosAlbum
};
typedef NSUInteger UIImagePickerControllerSourceType;
sourceType用来确定用户界面显示的样式：
共三种格式（模拟器上的效果图）
UIImagePickerControllerSourceTypePhotoLibrary,
UIImagePickerControllerSourceTypeCamera,
UIImagePickerControllerSourceTypeSavedPhotosAlbum
为了区分是否支持视频格式，一般要用到下面这个函数，以便确定mediaTypes。
+ (BOOL)isSourceTypeAvailable:(UIImagePickerControllerSourceType)sourceType
2: mediaTypes
@property(nonatomic,copy) NSArray *mediaTypes
mediaTypes用来确定再picker里显示那些类型的多媒体文件，图片？视频？
+ (NSArray *)availableMediaTypesForSourceType:(UIImagePickerControllerSourceType)sourceType
二：选取动作处理
UIImagePickerControllerDelegate
通过代理来完成用户在选中图片，或者choose视频时的处理方式：
共有三个可选的代理方法
– imagePickerController:didFinishPickingMediaWithInfo:
– imagePickerControllerDidCancel:
– imagePickerController:didFinishPickingImage:editingInfo: Deprecated in iPhone OS 3.0
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
info中包括选取的照片，视频的主要信息
NSString *const UIImagePickerControllerMediaType; 选取的类型 public.image public.movie
NSString *const UIImagePickerControllerOriginalImage; 修改前的UIImage object.
NSString *const UIImagePickerControllerEditedImage; 修改后的UIImage object.
NSString *const UIImagePickerControllerCropRect; 原始图片的尺寸NSValue object containing a CGRect data type
NSString *const UIImagePickerControllerMediaURL; 视频在文件系统中 的 NSURL地址
保存视频主要时通过获取其NSURL 然后转换成NSData
实例代码如下：
- (void) pickImage: (id) sender
{
UIImagePickerController *ipc = [ init];
if (){
ipc.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
ipc.mediaTypes =;
}
ipc.delegate = self;
ipc.allowsImageEditing = NO;
;
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *mediaType = ;
if (){
// UIImage *selectedImage = ;
UIImage *image = ;
NSLog(@"found an image");
atomically:YES];
SETIMAGE(image);
CFShow([ directoryContentsAtPath:]);
}
else if (){
NSURL *videoURL = ;
NSLog(@"found a video");
NSData *webData = ;
//NSData *video = [ initWithContentsOfURL:videoURL];
atomically:YES];
CFShow([ directoryContentsAtPath:]);
// NSLog(videoURL);
}
;
}
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