使用自動佈局根據條件調整標籤位置。

Question

我有兩個標籤，它們排列在另一個之上。這兩者都是在一個UITableViewCell：

我想有，做如下聲明：

if indexPath.row == 0 || indexPath.row == 1 { 
    //Remove the bottom label and center the top label vertically in the cell 
} 

if indexPath.row == 2 || indexPath.row == 3 { 
    //Keep both labels one on top of the other 
} 

這些都在一個文件的.xib創建並裝入一個表視圖。我想爲此使用自動佈局，並且我知道我需要使用幾個網點才能實現此功能。任何想法如何做到這一點？

Answer 1

func autolayout() 
{ 

    if indexPath.row == 0 || indexPath.row == 1 { 
     //Remove the bottom label and center the top label vertically in the cell 
     bottomLbl.hidden=true 
     self.constrainToplbl_top.constant = 20 

    } 

    if indexPath.row == 2 || indexPath.row == 3 { 
     //Keep both labels one on top of the other 
     self.constrainToplbl_top.constant = 24 
     self.constrainbottomlbl_top.constant = 2 



    } 
     self.layoutIfNeeded() 
} 

Answer 2

注意：不要複製的代碼，因爲它可能會導致編譯/語法錯誤

if indexPath.row == 0 || indexPath.row == 1 { 
    //Remove the bottom label and center the top label vertically in the cell 

    cell.lbl2.hidden = true 
    cell.constCenter.constant = -cell.lbl2.frame.size.height/2 
    // cell.constCenter obj of Label 1 center constraint below image display 
} 

if indexPath.row == 2 || indexPath.row == 3 { 
    //Keep both labels one on top of the other 
    cell.lbl2.hidden = false 
    cell.constCenter.constant = 0 
    //by default it is like so no need to do anything 
} 

//請丟棄在屏幕下方拍攝圖像

Answer 3

您在單元格中添加3 UILabels（topLbl，centerLbl，bottomLbl），然後隱藏並sh你需要顯示

if indexPath.row == 0 || indexPath.row == 1 { 
    //Remove the bottom label and center the top label vertically in the cell 
    topLbl.hidden=true 
    centerLbl.hidden=false 
    bottomLbl.hidden=true 
} 

if indexPath.row == 2 || indexPath.row == 3 { 
    //Keep both labels one on top of the other 
    topLbl.hidden=false 
    centerLbl.hidden=true 
    bottomLbl.hidden=false 
}