更改系统相机UIImagePickerController导航栏的cancle为自定义按钮

有时候需要对系统相册里面的取消按钮进行自定义，并获取点击事件做一些操作,那么你可以这样做。

第一:实现navigationController代理

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated

{

UIButton *cancelBtn = [[UIButton alloc]initWithFrame:CGRectMake(0,0,50,30)];

[cancelBtn setTitle:@"取消" forState:(UIControlStateNormal)];

cancelBtn.backgroundColor = [UIColor redColor];

[cancelBtn addTarget:self action:@selector(click) forControlEvents:(UIControlEventTouchUpInside)];

UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithCustomView:cancelBtn];

[viewController.navigationItem setRightBarButtonItem:btn animated:NO];

}

第二:实现click方法即可完成;self.imagePicker为弱引用

@property (nonatomic, weak) UIImagePickerController *imagePicker;

- (void)click{

//做你需要做的事情

[self imagePickerControllerDidCancel:self.imagePicker];

}