Camera

enum {
    UIImagePickerControllerSourceTypePhotoLibrary,//照片选取
    UIImagePickerControllerSourceTypeCamera, //相机
    UIImagePickerControllerSourceTypeSavedPhotosAlbum //相薄列表
};
typedef NSUInteger UIImagePickerControllerSourceType;

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        picker.allowsEditing = YES;
        
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        [self presentModalViewController:picker animated:YES];
        [picker release];
    }