【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 = [[UIImagePickerController alloc] init];
UIImagePickerControllerSourceTypePhotoLibrary]){
        ipc.sourceType =  UIImagePickerControllerSourceTypePhotoLibrary;
         ipc.mediaTypes =[UIImagePickerController availableMediaTypesForSourceType:ipc.sourceType];   
}
self;
 ipc.allowsImageEditing = NO;
 [self presentModalViewController:ipc animated:YES]; 
}
 
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary
{
 
 NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
if ([mediaType isEqualToString:@"public.image"]){
  // UIImage *selectedImage = [info objectForKey:UIImagePickerControllerOriginalImage];
   UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
      NSLog(@"found an image");
   [UIImageJPEGRepresentation(image, 1.0f) writeToFile:[self findUniqueSavePath] atomically:YES];
SETIMAGE(image);
  CFShow([[NSFileManager defaultManager] directoryContentsAtPath:[NSHomeDirectory() stringByAppendingString:@"/Documents"]]);
 }
else if ([mediaType isEqualToString:@"public.movie"]){
 
  NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
  NSLog(@"found a video");
NSData *webData = [NSData dataWithContentsOfURL:videoURL];
  //NSData *video = [[NSString alloc] initWithContentsOfURL:videoURL];
writeToFile:[self findUniqueMoviePath] atomically:YES];
   CFShow([[NSFileManager defaultManager] directoryContentsAtPath:[NSHomeDirectory() stringByAppendingString:@"/Documents"]]);
 
    // NSLog(videoURL);
 
 }
 [picker dismissModalViewControllerAnimated:YES];
}