Question

所以我有这段代码 -

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    self.searchController = [[PlacesViewController alloc]initWithNibName:@"PlacesView" bundle:nil];
    NSLog(@"TEXT FIELD DID BEGIN EDITIN");
    self.navigationItem.hidesBackButton = YES;
    [self.navigationController pushViewController:self.searchController animated:YES];
    return NO;
}

NSLog会运行，但我的视图不会显示。这发生在控制器中，该控制器具有导航栏中存在的视图。像这样 -

-(void)addSearchBar{
    self.searchBarController = [[SearchBarController alloc] initWithNibName: @"SearchBar" bundle: nil];
    self.navigationItem.titleView = self.searchBarController.view;
}

在initWithNibName方法中调用addSearchBar。

为什么我的观点没有出现？

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        searchQuery = [[SPGooglePlacesAutocompleteQuery alloc] init];
        searchDetailQuery = [[SPGooglePlacesPlaceDetailQuery alloc] init];
        searchQuery.radius = 2000;
        shouldBeginEditing = YES;
        locationManager = [[CLLocationManager alloc] init];
        locationManager.delegate = self;
        locationManager.distanceFilter = kCLDistanceFilterNone;
        locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        [locationManager startUpdatingLocation];

    }
    return self;
}

我也证明了这个观点是有效的，因为当我这样做时 -

-(void)textFieldDidBeginEditing:(UITextField *)textField{
    self.searchController = [[PlacesViewController alloc]initWithNibName:@"PlacesView" bundle:nil];
    //may have to be strong.
    NSLog(@"SELF VIEW : %@", self.view);
    textField.inputView.center = self.view.center;
    textField.inputView.bounds = self.view.bounds;
    textField.inputView = self.searchController.view;
}

视图显示在键盘的位置。

Answer 1

您可以将addSearchBar从initWithNibName移至viewDidLoad进行试用。实际上，通常在init方法中，视图不会初始化。该视图在首次访问时将被懒惰地初始化，通常是在屏幕上显示视图时，并且在初始化视图后将立即调用viewDidLoad方法。因此，init方法通常只配置与数据相关的属性，而视图相关属性通常在viewDidLoad方法中配置。

UIView没有出现

1 个答案: