子类UIVisualEffectView的问题

Question

我正在自定义一个Parse登录视图，我用一个库创建了一个模糊的背景，但是现在我可以使用UIVisualEffectView了。由于我有一个类作为PFLoginViewController的委托，所以我决定将UIVisualEffectView子类设置为我的委托。问题是，并不是我的登录视图都显示了。我知道我的框架设置正确。这是我对我说的话有更好的理解的代码。

-(id)initWithEffect:(UIVisualEffect *)effect {

    self = [super initWithEffect:effect];

    [self setUpUserViews];

    return self;

}

- (void)setUpUserViews {

    NSLog(@"Setting Up View");

    CGRect size = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);

    //Initialize login and sign up views
    _loginView = [[PFLogInViewController alloc] init];
    _signUpView = [[PFSignUpViewController alloc] init];

    //Set their delegates to this view controller
    [_loginView setDelegate:self];
    [_signUpView setDelegate:self];

    //Set fields for sign up view
    [_signUpView setFields:PFSignUpFieldsEmail | PFSignUpFieldsUsernameAndPassword | PFSignUpFieldsSignUpButton];

    //Set sign up view for login view
    [_loginView setSignUpController:_signUpView];

    //Set up login view
    _loginView.view.frame = size;

    _loginView.view.backgroundColor = [UIColor clearColor];

    [_loginView.logInView setLogo:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"banner.png"]]];

    //Set Login Button
    [_loginView.logInView.logInButton setBackgroundImage:[UIImage imageNamed:@"orange.png"] forState:UIControlStateNormal];
    [_loginView.logInView.logInButton setBackgroundImage:[UIImage imageNamed:@"orangeDown.png"] forState:UIControlStateHighlighted];

    //Set login text color
    [_loginView.logInView.logInButton setTitleColor:[UIColor orangeColor] forState:UIControlStateNormal];
    [_loginView.logInView.logInButton setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];

    //Set sign up button
    [_loginView.logInView.signUpButton setBackgroundImage:[UIImage imageNamed:@"green.png"] forState:UIControlStateNormal];
    [_loginView.logInView.signUpButton setBackgroundImage:[UIImage imageNamed:@"greenDown.png"] forState:UIControlStateHighlighted];

    //Set sign up button text color
    [_loginView.logInView.signUpButton setTitleColor:[UIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:0.6] forState:UIControlStateNormal];
    [_loginView.logInView.signUpButton setTitleColor:[UIColor whiteColor] forState:UIControlStateHighlighted];

    //Set dismiss button
    [_loginView.logInView.dismissButton setImage:nil forState:UIControlStateNormal];
    [_loginView.logInView.dismissButton setImage:nil forState:UIControlStateHighlighted];

    [_loginView.logInView.dismissButton setBackgroundImage:nil forState:UIControlStateHighlighted];
    [_loginView.logInView.dismissButton setBackgroundImage:nil forState:UIControlStateNormal];

    [_loginView.logInView.dismissButton setBackgroundImage:[UIImage imageNamed:@"dismiss.png"] forState:UIControlStateHighlighted];
    [_loginView.logInView.dismissButton setBackgroundImage:[UIImage imageNamed:@"dismiss.png"] forState:UIControlStateNormal];

    //Set forgotten button
    [_loginView.logInView.passwordForgottenButton setImage:[UIImage imageNamed:@"forgot.png"] forState:UIControlStateNormal];
    [_loginView.logInView.passwordForgottenButton setImage:[UIImage imageNamed:@"forgot.png"] forState:UIControlStateHighlighted];

    [_loginView.logInView.passwordForgottenButton setBackgroundImage:nil forState:UIControlStateNormal];
    [_loginView.logInView.passwordForgottenButton setBackgroundImage:nil forState:UIControlStateHighlighted];

    //Use custom method for showing sign up view
    [_loginView.logInView.signUpButton  removeTarget:nil action:NULL  forControlEvents:UIControlEventAllEvents];

    [_loginView.logInView.signUpButton  addTarget:self action:@selector(customViewMethod) forControlEvents:UIControlEventTouchUpInside];

    //Set up sign up view
    _signUpView.signUpView.backgroundColor = [UIColor clearColor];

    //Set sign up button
    [_signUpView.signUpView.signUpButton setImage:[UIImage imageNamed:@"green.png"] forState:UIControlStateNormal];
    [_signUpView.signUpView.signUpButton setImage:[UIImage imageNamed:@"greenPress.png"] forState:UIControlStateHighlighted];

    [_signUpView.signUpView.signUpButton setBackgroundImage:nil forState:UIControlStateNormal | UIControlStateHighlighted];

    //Present login view
    [self.contentView addSubview:_loginView.view];
}

这是我得到的截图。左上角有一个X。这是登录视图的一部分：

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下面是它应该是什么样子的截图：

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Answer 1

这个问题已经解决了。问题是，内存释放得太快，导致出现了一个nil代表。