场景：快速多次点击cell跳转到另一个页面，另一个页面被push多次。
原因：push后的页面有耗时操作或者刚好push到另一个页面时，另一个页面正好在reloadData卡住主线程。造成点击cell时卡住了。
解决方法：在基类导航控制器中重写导航控制器的push方法。
#import "ZDBaseNavigationController.h"
@interface ZDBaseNavigationController ()<UINavigationControllerDelegate>
@property (nonatomic, getter=isPushing) BOOL pushing;///< 是否正在push，防止多次push同一个VC
@end
@implementation ZDBaseNavigationController
- (void)viewDidLoad {
[super viewDidLoad];
self.delegate = self;
}
#pragma mark - Push
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
if (self.isPushing) {
NSLog(@"拦截多次push同一个VC");
return;
} else {
self.pushing = YES;
}
[super pushViewController:viewController animated:animated];
}
- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animated
{
self.pushing = NO;
}
