ios - iOS segue运行缓慢-即使对destinationViewController没有任何处理

我有一个按钮segue'到一个新的viewController。当我按下按钮时，在出现新的视图控制器之前会有3-4秒的可见延迟。我已经阅读了关于stackoverflow的其他问题，通常问题出在destinationViewController或sourceViewController(尚未完成)上。就我而言，如果我在destinationViewController的viewDidLoad上设置了一个断点，则即使执行该代码之前也会发生延迟。

另外，我的代码不会执行任何耗时超过一毫秒的操作。

这是我的destinationViewController的代码。我在prepareForSegue ...方法中什么都没有。

我如何摆脱这种延迟？谢谢!

如果您需要其他诊断方法，请随时提出，谢谢。

#import "ViewSettingsViewController.h"

@interface ViewSettingsViewController ()

@end

@implementation ViewSettingsViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    if ([HelperMethods getUserPreference:@"notificationTime"]==nil) {
        NSDate * now = [[NSDate alloc] init];
        NSCalendar *cal = [NSCalendar currentCalendar];
        NSDateComponents * comps = [cal components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
        [comps setHour:19];
        [comps setMinute:0];
        [comps setSecond:0];
        NSDate * date = [cal dateFromComponents:comps];
        [self.timePicker setDate:date animated:TRUE];
    } else {
        [self.timePicker setDate:[HelperMethods getUserPreference:@"notificationTime"]];
    }
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

-(void) viewWillDisappear:(BOOL)animated {
    if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
        // back button was pressed.  We know this is true because self is no longer
        // in the navigation stack.
        [HelperMethods setUserPreference:self.timePicker.date forKey:@"notificationTime"];

    }
    [super viewWillDisappear:animated];
}

@end

最佳答案

弄清楚了。原来滞后时间在这一行:

[super viewDidLoad]

这是从destinationViewController viewDidLoad方法调用的。那就是重新加载每次启动segue的视图，这是一个繁重的方法。我对此进行了评论，并解决了该问题。不知道为什么我要每次都重新加载 super 视图...

关于ios - iOS segue运行缓慢-即使对destinationViewController没有任何处理，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/28419849/