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：
重写导航控制器的push方法。
#import "DemoNavViewController.h"
@interface DemoNavViewController () <UINavigationControllerDelegate>
// 记录push标志
@property (nonatomic, getter=isPushing) BOOL pushing;
@end
@implementation DemoNavViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.delegate = self;
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
if (self.pushing == YES) {
NSLog(@"被拦截");
return;
} else {
NSLog(@"push");
self.pushing = YES;
}
[super pushViewController:viewController animated:animated];
}
#pragma mark - UINavigationControllerDelegate
-(void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
self.pushing = NO;
}
@end
