UILabel未更新与IBOutlet的连接

Question

我正在尝试更新IBOutlet的UILabel，但是由于某种原因，内容没有得到更新。最初，内容是从模型加载的，该模型异步执行 jsonResponse。但是，一旦内容存在，我就设置了一个委托来更新我为其调用 setNeedsDisplay 的布局。

这里的任何帮助将不胜感激。

谢谢。

下面的代码：

@interface pd ()
@property (nonatomic,retain) NSDictionary *pD;
@property (nonatomic, retain) pd_model *pdModel;
@end
@implementation pd
@synthesize pD = _pD, pdModel;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil :(NSDictionary*)pD {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        self.productDetails = [[NSDictionary alloc] initWithDictionary:pD];
        self.pdModel = [[ProductDetails_Model alloc] init:pD];
        self.pdModel.delegate = self;
        NSLog(@"%@",[self.pD description]);
    }
    return self;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    [scrollView setBackgroundColor:[UIColor clearColor]];
    [self.view addSubview:scrollView];
    scrollView.showsHorizontalScrollIndicator = YES;
    scrollView.scrollEnabled = YES;
    // Do any additional setup after loading the view from its nib.
    productRecCarousel = [[iCarousel alloc] initWithFrame:CGRectMake(0.0f, scrollView.contentSize.height, 320.0f, 100.0)];
    productRecCarousel.delegate = self;
    [scrollView addSubview:productRecCarousel];
    [self addProductDescription];
    NSLog(@"%@",[self.pdModel responseCode]);
    [soldBy setText:[self.pdModel responseCode]];
    //[soldBy setText:@"1"];
}
- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark
#pragma mark CarouselDelegate methods
- (NSUInteger)numberOfItemsInCarousel:(iCarousel *)carousel {
    return 1;
}
- (NSUInteger)numberOfPlaceholdersInCarousel:(iCarousel *)carousel {
    return 1;
}
- (UIView*)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view {
    return [[UIView alloc] init];
}
- (CGFloat)carouselItemWidth:(iCarousel *)carousel {
    //usually this should be slightly wider than the item views
    return 150;
}
- (CATransform3D)carousel:(iCarousel *)_carousel transformForItemView:(UIView *)view withOffset:(CGFloat)offset {
    //implement 'flip3D' style carousel
    //set opacity based on distance from camera
    view.alpha = 1.0 - fminf(fmaxf(offset, 0.0), 1.0);
    //do 3d transform
    CATransform3D transform = CATransform3DIdentity;
    transform.m34 = _carousel.perspective;
    transform = CATransform3DRotate(transform, M_PI / 8.0, 0, 1.0, 0);
    return CATransform3DTranslate(transform, 0.0, 0.0, offset * _carousel.itemWidth);
}
- (void)addProductDescription {
    NSLog(@"%f",addProductDetails.frame.size.height);
    addProductDetails.frame = CGRectMake(0.0f, productRecCarousel.frame.size.height, addProductDetails.frame.size.width, addProductDetails.frame.size.height);
    [scrollView addSubview:addProductDetails];

}
- (void)updateTheLayout {
    //[self.view setNeedsDisplay];
   //This is where I get the delegate called once the model is being updated. I tried scrollView and self.view setNeedsDisplay and setNeedsLayout but the IBoutlet never gets updated which is in "ViewDidLoad as assigned as" : [soldBy setText:[self.pdModel responseCode]];
}

谢谢。

Answer 1

所以你只需要从updateTheLayout而不是从viewDidLoad调用[soldBy setText:[self.pdModel responseCode]];，因为它还没有准备好。并确保从主线程更新 UI 元素。

Answer 2

您必须

在回调中调用[soldBy setText:[self.pdModel responseCode]];，而不是在viewDidLoad方法中调用。