重定义 UIImagePickerController

今天想实现一个类似Path 的Photo Picker的效果，没有Cancel按钮，取而代之的是添加一个从相册获取的按钮，要知道这在官方的SDK里面是没有。
开始之前，先做下功课，找到几个相关的文章

http://blog.airsource.co.uk/index.php/2008/11/11/views-of-uiimagepickercontroller/

http://www.cocoachina.com/bbs/read.php?tid-11664-page-1.html>
以下的这个框架图对接下来的工作会很有帮助
红色的高亮部分是从屏幕上看到的照片的预览图，除了这个之外，他上面的view都可以去掉。
要想编辑这些个View,得先找到他们,这里给出了个方法

#pragma mark get/show the UIView we want
//Find the view we want in camera structure.
-(UIView *)findView:(UIView *)aView withName:(NSString *)name{
    Class cl = [aView class];
    NSString *desc = [cl description];

    if ([name isEqualToString:desc])
        return aView;

    for (NSUInteger i = 0; i < [aView.subviews count]; i++)
    {
        UIView *subView = [aView.subviews objectAtIndex:i];
        subView = [self findView:subView withName:name];
        if (subView)
            return subView;
    }
    return nil;
}

怎么用，下面这段代码里给出了比较详细的例子

-(void)addSomeElements:(UIViewController *)viewController{
    //Add the motion view here, PLCameraView and picker.view are both OK
    UIView *PLCameraView=[self findView:viewController.view withName:@"PLCameraView"];
    [PLCameraView addSubview:touchView];//[viewController.view addSubview:self.touchView];//You can also try this one.

    //Add button for Timer capture
    [PLCameraView addSubview:timerButton];
    [PLCameraView addSubview:continuousButton];

    [PLCameraView insertSubview:bottomBarImageView atIndex:1];

    //Used to hide the transiton, last added view will be the topest layer
    [PLCameraView addSubview:myTransitionView];

    //Add label to cropOverlay
    UIView *cropOverlay=[self findView:PLCameraView withName:@"PLCropOverlay"];
    [cropOverlay addSubview:lblWatermark];

    //Get Bottom Bar
    UIView *bottomBar=[self findView:PLCameraView withName:@"PLCropOverlayBottomBar"];

    //Get ImageView For Save
    UIImageView *bottomBarImageForSave = [bottomBar.subviews objectAtIndex:0];

    //Get Button 0
    UIButton *retakeButton=[bottomBarImageForSave.subviews objectAtIndex:0];
    [retakeButton setTitle:@"重拍" forState:UIControlStateNormal];

    //Get Button 1
    UIButton *useButton=[bottomBarImageForSave.subviews objectAtIndex:1];
    [useButton setTitle:@"保存" forState:UIControlStateNormal];

    //Get ImageView For Camera
    UIImageView *bottomBarImageForCamera = [bottomBar.subviews objectAtIndex:1];

    //Set Bottom Bar Image
    UIImage *image=[[UIImage alloc] initWithContentsOfFile:[[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"BottomBar.png"]];
    bottomBarImageForCamera.image=image;
    [image release];

    //Get Button 0(The Capture Button)
    UIButton *cameraButton=[bottomBarImageForCamera.subviews objectAtIndex:0];
    [cameraButton addTarget:self action:@selector(hideTouchView) forControlEvents:UIControlEventTouchUpInside];

    //Get Button 1
    UIButton *cancelButton=[bottomBarImageForCamera.subviews objectAtIndex:1];
    [cancelButton setTitle:@"取消" forState:UIControlStateNormal];
    [cancelButton addTarget:self action:@selector(hideTouchView) forControlEvents:UIControlEventTouchUpInside];
}

++++++++++++++++++++++++++++
兔子说可以这么实现：
先 picker.showsCameraControls=NO;
然后自己自定义 picker.cameraOverlayView
有待验证~
[picker.topViewController.navigationController pushViewController:controller animated:YES];

转 http://blog.cnrainbird.com/index.php/2012/03/14/zhong_ding_yi_-uiimagepickercontroller/ 

以下还有其它的资料：

http://blog.airsource.co.uk/index.php/2008/11/11/views-of-uiimagepickercontroller/ 

http://hi.baidu.com/lishiq820/item/81011ee084ed4015595dd822