关于pushViewController不正常运行
pushViewController在AppDelegate中不正常运行，只有警报视图解除了。
代码：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
loginReapeat = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:@selector(repeatLoginProcess) userInfo:nil repeats:YES];
//First Launch Settings
if ([[NSUserDefaults standardUserDefaults] boolForKey:@"FirstLaunch"])
{
}
else
{
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"FirstLaunch"];
[[NSUserDefaults standardUserDefaults] synchronize];
[self alertShow];
}
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
return YES;
}
-(void)alertShow{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Help!" message:@"Need some help to use this App? Please tap the 'Help' button." delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Help",nil];
[alert show];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
if([title isEqualToString:@"Help"])
{
SignUp *signUp = [[SignUp alloc]initWithNibName:@"SignUp" bundle:nil]
[self.navigationController pushViewController:signUp animated:YES];
}
}
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原因有可能是你在执行
alertview代理方法的内部pushViewController时,当前的window还没有设置好它的rootViewcontroller.所以你可以尝试这样改一下- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { loginReapeat = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:@selector(repeatLoginProcess) userInfo:nil repeats:YES]; [window addSubview:[navigationController view]]; //先设置window 的rootViewcontroller //First Launch Settings if (![[NSUserDefaults standardUserDefaults] boolForKey:@"FirstLaunch"]) { [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"FirstLaunch"]; [[NSUserDefaults standardUserDefaults] synchronize]; [self alertShow]; } [window makeKeyAndVisible]; return YES; }2019-07-17 19:08:07赞同 展开评论 打赏
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