ios - 更新约束值不起作用IOS 9 Beta

Question

- (void)viewDidLoad {
    [super viewDidLoad];
    self.sendMessageButton.layer.cornerRadius = 3;
    self.messageText.layer.cornerRadius = 3;
    self.imageView.layer.cornerRadius = 3;
    self.messageText.delegate = self;
    self.objectImage.hidden = YES;
    self.sendImageButton.hidden = NO;
    self.imageView.hidden= NO;
    [self updateViewsHeight];

}

-(void)updateViewsHeight{
        NSLog(@"--------------------- %f -----------------------", self.view.frame.size.height);

        if (self.view.frame.size.height == 568.0){ //5s & 5
            self.textViewHeight.constant = 500.f;
            self.ImageViewHeight.constant = 10.f;
            [super updateViewConstraints];}
    }

这不会更新约束。她达到了原始高度，但我确定可以读取if内的代码，因为当我在应用程序中进行一个中断时，它就会中断它。

这是我的属性:

@property (weak, nonatomic) IBOutlet NSLayoutConstraint *imageViewHeight;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *textViewHeight;

Answer 1

显然发生的是IOS 9 Beta中的错误。当您删除常量并删除设备应用程序时，代码便起作用了。色调