调用相机需要引入两个代理

UIImagePickerControllerDelegate,UINavigationControllerDelegate

否则出出现：

设置delegate时候，出现警告：Assigning to ‘id<UINavigationControllerDelegate,UIImagePickerControllerDelegate>’ from incompatible type ‘AddSightingViewController *const __strong’

解决过程】

1.问题很明显是 strong不兼容，然后就去试试，把相应的AddSightingViewController改一下，从

@property (nonatomic) UIImagePickerController *imgPickerController;

改为：

@property (nonatomic, weak) UIImagePickerController *imgPickerController;

然后就消除了此警告了。

注：有时候Xcode不能及时消除警告和错误，需要手动去Product->Clean一下。

【总结】

好像Property变量，如果不指定引用类型，则默认是strong引用，此处改为weak，即可解除此警告。

而另外关于weak，strong等更详细的含义，有空再整理。

//相机

-(void)takePhotoAction:(UIButton *)sender{

    FZLog(nil, nil);

    //先设定sourceType为相机，然后判断相机是否可用（ipod）没相机，不可用将sourceType设定为相片库

    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera]) {

        UIImagePickerController *picker = [[UIImagePickerController alloc] init];//初始化

        picker.delegate = self;

        picker.allowsEditing = YES;//设置可编辑

        /*sourceType = UIImagePickerControllerSourceTypeCamera; //照相机

         sourceType = UIImagePickerControllerSourceTypePhotoLibrary; //图片库

        sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片

         */

        picker.sourceType = UIImagePickerControllerSourceTypeCamera;

        [self presentViewController:picker animated:YES completion:nil];//进入照相界面

    }

}

// 打开相册：（区分pad和iphone）

-(void)openPhotosAction:(UIButton *)sender{

   // for iphone：

    UIImagePickerController *pickerImage = [[UIImagePickerController alloc] init];

    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {

        pickerImage.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

        //pickerImage.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

        pickerImage.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:pickerImage.sourceType];

    }

    pickerImage.delegate = self;

    pickerImage.allowsEditing = NO;

    [self presentViewController:pickerImage animated:YES completion:nil];//进入照相界面

}

//for ipad:

-(void)ipadPicker{

    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    //sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; //保存的相片

    UIImagePickerController *picker = [[UIImagePickerController alloc] init];

    picker.delegate = self;

    picker.allowsEditing = NO;//是否允许编辑

    picker.sourceType = sourceType;

    /*

     如果从一个导航按钮处呈现，使用：

     presentPopoverFromBarButtonItem:permittedArrowDirections:animated:；

     如果要从一个视图出呈现，使用：

     presentPopoverFromRect:inView:permittedArrowDirections:animated:

     如果设备旋转以后，位置定位错误需要在父视图控制器的下面方法里面重新定位：

     didRotateFromInterfaceOrientation:（在这个方法体里面重新设置rect）

     然后再次调用：

     - (void)presentPopoverFromRect:(CGRect)rect inView:(UIView *)view permittedArrowDirections:(UIPopoverArrowDirection)arrowDirections animated:(BOOL)animated

     */

    //UIPopoverController只能在ipad设备上面使用；作用是用于显示临时内容，特点是总是显示在当前视图最前端，当单击界面的其他地方时自动消失。

    UIPopoverController *popover = [[UIPopoverController alloc]initWithContentViewController:picker];

    //permittedArrowDirections 设置箭头方向

    [popover presentPopoverFromRect:CGRectMake(0, 0, 300, 300) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];

}

调用相机自定义《中文显示，相机全屏》

中文相机

   在Iphone利用UIImagePickerController调用系统照相机一文中介绍了怎样调用系统照相机。但是有时候我需要自定义相机内容，需要以相机内容为背景，在其视图上添加其他控件，下面是相机试图最大化的实例。

-(void)onClickbutton:(id)sender

{

        UIImagePickerController *controller = [[UIImagePickerController alloc] init];

        [controller setSourceType:UIImagePickerControllerSourceTypeCamera];

        [controller setShowsCameraControls:NO];

        CGAffineTransform cameraTransform = CGAffineTransformMakeScale(1.25,1.25);

        controller.cameraViewTransform = cameraTransform;

        [self presentViewController:controller animated:YES completion:nil];//进入照相界面

}