线上崩溃反馈
96671211-F3FB-4532-BB8C-831DED659A0D.png
猜想崩溃原因
某一时刻、某一场景突然连续push多个界面动画相关导致（比如有说多个通知、多个回调一起执行连续push）
问题重现简化代码，
- (void)clickButton {
ViewController *vc1 = ViewController.new;
vc1.title = @"vc1";
ViewController *vc2 = ViewController.new;
vc2.title = @"vc2";
ViewController *vc3 = ViewController.new;
vc3.title = @"vc3";
[self.navigationController pushViewController:vc1 animated:NO];
[self.navigationController pushViewController:vc2 animated:YES];
[self.navigationController pushViewController:vc3 animated:YES];
}
代码执行完在vc3点击返回vc2时候，发现vc2界面的view没有显示出来，继续点击vc2的返回按钮时候，就崩溃闪退了
解决问题
#import "ZYXNavigationController.h"
@interface ZYXNavigationController ()<UINavigationControllerDelegate>
@property (assign, nonatomic) BOOL isSwitching;
@property (nonatomic, strong) NSMutableArray *pushVCArr;/**< */
@end
@implementation ZYXNavigationController
- (void)viewDidLoad {
[super viewDidLoad];
self.pushVCArr = [NSMutableArray array];
self.delegate = self;
}
// 重载 push 方法
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
if (animated) {
if (self.isSwitching) {
[self.pushVCArr addObject:viewController];// 1. 如果是动画，并且正在切换，保存viewController
return;
}
self.isSwitching = YES; // 2. 否则修改状态
}
[super pushViewController:viewController animated:animated];
}
#pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
self.isSwitching = NO; // 3. 还原状态
if (self.pushVCArr.count>0) {
// 取出保存的vc，执行push
UIViewController *vc = self.pushVCArr[0];
[self pushViewController:viewController animated:YES];
[self.pushVCArr removeObject:vc];
}
}
@end
