自定义UINavigationController点击返回和滑动返回

UIViewController一般有点击UINavigationController左上角返回按钮关闭和向右滑动关闭两种方式.

但若定义了UINavigationController的leftBarButtonItem后，UIVIewController是无法再滑动返回的.

不过，如果加上下面这句，便可以自定义LeftBarButtonItem后，仍然可以实现滑动关闭ViewController的功能:

self.navigationController.interactivePopGestureRecognizer.delegate=nil;

以下是一个完整的例子:

UIButton* button = [[UIButtonalloc]initWithFrame:CGRectMake(0,0,60,60)];

[buttonsetImage:[UIImageimageNamed:@"btn_back_white"]forState:UIControlStateNormal];

[buttonaddTarget:selfaction:@selector(onBackClick)forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem* backButton = [[UIBarButtonItemalloc]initWithCustomView:button];

self.navigationItem.leftBarButtonItem= backButton;

self.navigationController.interactivePopGestureRecognizer.delegate=nil;