ios - 以编程方式创建的 UILabel 未出现在 IOS 7 Storyboard中

Question

基本上，我的简单问题是以编程方式创建的 UILabel 没有出现在 IOS 7 模拟器中，但它可以在 IOS 6 模拟器上运行，我正在使用 Storyboard

我的代码是:

 UILabel *lbl_top = [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 100, 100)];
    lbl_top.text = text;
    lbl_top.font = customFont;
    lbl_top.numberOfLines = 1;
    lbl_top.baselineAdjustment = UIBaselineAdjustmentAlignBaselines; 
    lbl_top.adjustsFontSizeToFitWidth = YES;
    lbl_top.adjustsLetterSpacingToFitWidth = YES;
    lbl_top.minimumScaleFactor = 10.0f/12.0f;
    lbl_top.clipsToBounds = YES;
    lbl_top.backgroundColor = [UIColor clearColor];
    lbl_top.textColor = [UIColor blackColor];
    lbl_top.textAlignment = NSTextAlignmentLeft;
    lbl_top.hidden = FALSE;
    lbl_top.alpha = 1.0;
    [self.view addSubview:lbl_top];

合并打印:

lbl_top 的打印说明:

UILabel: 0x8dae430;帧 = (10 100; 100 100); text = 'Power issues - Power Surv...'; clipsToBounds = YES; userInteractionEnabled = NO;层 = CALayer: 0x8db5f30

在 IOS 6 模拟器中

在 IOS 7 模拟器中

Answer 1

try this code 

UILabel *lbl_top = [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 100, 100)];
lbl_top.text = @"agssudass ";
lbl_top.font = [UIFont systemFontOfSize:15.0];
lbl_top.numberOfLines = 1;
lbl_top.baselineAdjustment = UIBaselineAdjustmentAlignBaselines;
lbl_top.adjustsFontSizeToFitWidth = YES;
lbl_top.adjustsLetterSpacingToFitWidth = YES;
lbl_top.minimumScaleFactor = 10.0f/12.0f;
lbl_top.clipsToBounds = YES;
lbl_top.backgroundColor = [UIColor blackColor];
lbl_top.textColor = [UIColor whiteColor];
lbl_top.textAlignment = NSTextAlignmentLeft;
lbl_top.hidden = FALSE;
lbl_top.alpha = 1.0;
[self.view addSubview:lbl_top];

改变是

lbl_top.text = @"agssudass ";
lbl_top.backgroundColor = [UIColor blackColor];
lbl_top.font = [UIFont systemFontOfSize:15.0]; 
lbl_top.textColor = [UIColor whiteColor];