使用viewWithTag創建視圖Swift可選項問題

Question

我正在使用GitHub項目來重新創建iOS項目中Android中存在的「籌碼」組件。我想在斯威夫特寫這個Objective-C代碼：

NSArray *nibContents = [[NSBundle mainBundle] loadNibNamed:@"TokenView" owner:nil options:nil]; 
UIView *view = nibContents[0]; 
UILabel *label = (UILabel *)[view viewWithTag:2]; 
UIButton *button = (UIButton *)[view viewWithTag:3]; 

[button addTarget:self action:@selector(tokenDeleteButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; 

label.text = self.tokens[index]; 
CGSize size = [label sizeThatFits:CGSizeMake(1000, 40)]; 
view.frame = CGRectMake(0, 0, size.width + 97, 40); 
return view; 

這是我到目前爲止所。

let view = Bundle.main.loadNibNamed("TokenView", owner: nil, options: nil)?[0] as? UIView 

    if let imageView = UIImageView().viewWithTag(1) as? UIImageView { 
     imageView.image = UIImage(named: "pic.png") 
    } 

    if let label = UILabel().viewWithTag(2) as? UILabel { 
     label.text = (tokens[Int(index)] as! NSString) as String 
     let size = (label.sizeThatFits(CGSize(width: 1000, height: 40))) 
     view?.frame = CGRect(x: 0, y: 0, width: size.width + 97, height: 40) 
    } 

    if let deleteButton = UIButton().viewWithTag(3) as? UIButton { 
     deleteButton.addTarget(self, action: #selector(tokenDeleteButtonPressed(tokenButton:)), for: .touchUpInside) 
    } 

    return view 

我遇到的問題是，該的UILabel，UIButton的和的UIImageView都是零，我似乎無法找出原因。 當我嘗試調試它，並打印每個視圖的描述我得到的是的UIImageView（超出範圍）

我一直在閱讀，觀看視頻自選，我知道如何使用它進行簡單案件，但這似乎有點複雜。

Answer 1

您正在創建一個標籤，Button和imageview。所以你的代碼應該如下所示。我假設標籤，Button和imageview是TokenView的子視圖

let view = Bundle.main.loadNibNamed("TokenView", owner: nil, options: nil)?[0] as? UIView 

if let imageView = view?.viewWithTag(1) as? UIImageView { 
     imageView.image = UIImage(named: "pic.png") 
    } 

    if let label =view?.viewWithTag(2) as? UILabel { 
     label.text = (tokens[Int(index)] as! NSString) as String 
     let size = (label.sizeThatFits(CGSize(width: 1000, height: 40))) 
     view?.frame = CGRect(x: 0, y: 0, width: size.width + 97, height: 40) 
    } 

    if let deleteButton = view?.viewWithTag(3) as? UIButton { 
     deleteButton.addTarget(self, action: #selector(tokenDeleteButtonPressed(tokenButton:)), for: .touchUpInside) 
    }