如何添加UILabel上面的UILabel

Question

如果我設置bottomLabel .text =中文字符，我看不到aboveLabel當我運行它，如果我調試視圖層次結構，我可以看到it.so有什麼問題？

UILabel *bottomLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, 200, 40)]; 
    bottomLabel.backgroundColor = [UIColor redColor]; 
    bottomLabel.text = @"中文"; 
    [self.view addSubview:bottomLabel]; 
    UILabel *aboveLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 60, 30)]; 
    aboveLabel.backgroundColor = [UIColor greenColor]; 
    aboveLabel.text = @"aboveLabel"; 
    [bottomLabel addSubview:aboveLabel]; 

Answer 1

您將以上標籤添加爲bottomLabel的子視圖，因此當您將漢字分配給它時，它不會顯示。您可以看到它的視圖層次結構，因爲它被分配了一個框架並添加爲子視圖。如果你想在UILabel上面添加一個UILabel，你可以添加兩個標籤作爲普通父視圖的子視圖。 即

[self.view addSubview:bottomLabel]; 
[self.view addSubview:aboveLabel]; 

Answer 2

您正在嘗試加入aboveLabel的bottomLabel內。相反都添加到一個視圖或self.view。

Answer 3

因爲上述標籤是像上面圖像，這樣不顯示，如果見上文標記x位置改變該標籤然後將它顯示底部標籤上重疊。

如果x值設置爲50，則顯示底部標籤。

Answer 4

UILabel *bottomLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, 200, 40)]; 
    bottomLabel.backgroundColor = [UIColor redColor]; 
    bottomLabel.text = @"中文"; 
    [self.view addSubview:bottomLabel]; 
    UILabel *aboveLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, CGRectGetMaxY(bottomLabel.frame)+10, 60, 30)]; 
    aboveLabel.backgroundColor = [UIColor greenColor]; 
    aboveLabel.text = @"aboveLabel"; 
    [self.view addSubview:aboveLabel]; 

Answer 5

你爲什麼不使用NSMutableAttributedString這一個標籤。

NSString *text1 = @"Hello"; 
NSString *date1 = @"            12.05 Pm\n"; 

NSString *text2 = @"World"; 
NSString *date2 = @"            11.00 AM"; 


self.lbl.numberOfLines = 0; 

NSString * str = [text1 stringByAppendingString:date1]; 
NSString * str2 = [text2 stringByAppendingString:date2]; 



UIFont *text1Font = [UIFont fontWithName:@"HelveticaNeue-Medium" size:10]; 
NSMutableAttributedString *attributedString1 = [[NSMutableAttributedString alloc] initWithString: str attributes:@{ NSFontAttributeName : text1Font }]; 
NSMutableParagraphStyle *paragraphStyle1 = [[NSMutableParagraphStyle alloc] init]; 
[paragraphStyle1 setAlignment: NSTextAlignmentLeft]; 
[paragraphStyle1 setLineSpacing:1]; 
[attributedString1 addAttribute:NSParagraphStyleAttributeName value: paragraphStyle1 range:NSMakeRange(0, [attributedString1 length])]; 


UIFont *text2Font = [UIFont fontWithName:@"HelveticaNeue-Medium" size:10]; 
NSMutableAttributedString *attributedString2 = [[NSMutableAttributedString alloc] initWithString: str2 attributes:@{NSFontAttributeName : text2Font }]; 
NSMutableParagraphStyle *paragraphStyle2 = [[NSMutableParagraphStyle alloc] init]; 
[paragraphStyle2 setLineSpacing:1]; 
[paragraphStyle2 setAlignment: NSTextAlignmentLeft]; 
[attributedString2 addAttribute:NSParagraphStyleAttributeName value: paragraphStyle2 range:NSMakeRange(0, [attributedString2 length])]; 

    [attributedString1 appendAttributedString:attributedString2]; 

    [self.lbl setAttributedText:attributedString1]; 

Answer 6

試試這個代碼

的Objective - C

UILabel *bottomLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 200, 30)]; 
    bottomLabel.backgroundColor = [UIColor redColor]; 
    bottomLabel.text = @"中文"; 
    [self.view addSubview:bottomLabel]; 
    UILabel *aboveLabel = [[UILabel alloc]initWithFrame:CGRectMake(50, 0, 60, 30)]; 
    aboveLabel.backgroundColor = [UIColor greenColor]; 
    aboveLabel.text = @"abc"; 
    [bottomLabel addSubview:aboveLabel];