unable to addSubView

Question

我在我的主视图控制器中有这个方法：

-(void)showDialog {    
    if (stopDialogController == nil)
        stopDialogController = [[StopDialogController alloc] initWithNibName:@"StopDialog" bundle:nil WithStop:@"CLAS"];
    if (stopDialogController)
        [stopDialogController presentWithSuperview:self.view withStopName:@"Evan Kimia"]; 
}

如果我使用self showDialog从同一个视图控制器中调用它，那么它可以很好地执行，但是如果我将这个主类的指针传递给另一个视图控制器，它将被执行，但是视图不会像它应该的那样被添加到主视图控制器的子视图中，我不知道为什么。下面是presentWithSuperview方法：

- (void)presentWithSuperview:(UIView *)superview withStopName:stopName;
{
    NSLog(@"present w/ superview called.");
    [superview addSubview:self.view];
    stopNameLabel.text=stopName;

}

Answer 1

我做了一个小的例子项目，我不能重现你正在经历的问题。在我的最小项目中，我有3个视图控制器: MainViewController、SecondViewController和ThirdViewController。我将粘贴下面的相关方法，请检查您的项目和此示例之间的差异，这也可能是一个好主意，以张贴更多的代码。

MainViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    ThirdViewController *thirdViewController = [[ThirdViewController alloc] init];
    thirdViewController.mainViewController = self;
    [thirdViewController showDialogIndirect];
}

-(void)showDialog {    
    if (secondViewController == nil)
        secondViewController = [[SecondViewController alloc] initWithNibName:nil bundle:nil WithStop:@"CLAS"];
    if (secondViewController)
        [secondViewController presentWithSuperview:self.view withStopName:@"Evan Kimia"]; 
}

SecondViewController

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil WithStop:(NSString *)stopString {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if(self){
        // init here
    }
    return self;
}

-(void)presentWithSuperview:(UIView *)superView withStopName:(NSString *)stopName {
    NSLog(@"present %@ with superview %@ and stopName %@", self, superView, stopName);
    self.view.backgroundColor = [UIColor redColor];
    [superView addSubview:self.view];
}

ThirdViewController

-(void) showDialogIndirect {
    [self.mainViewController showDialog];
}