ios - 以编程方式在 Swift 中为 iOS 制作带有名称首字母的图像，例如 Gmail

Question

我需要在 UITableView 中显示每个用户的个人资料图片，对应于他的名字。在下载图像之前，我需要像在 GMail 应用程序中一样显示带有他名字的第一个字母的图像。如何在 Swift for iOS 中以编程方式执行此操作？

Answer 1

“不需要任何框架”

“它的工作很棒”

@IBOutlet weak var IBtxtFieldName:UITextField!
@IBOutlet weak var IBtxtFieldSurname:UITextField!
@IBOutlet weak var IBImgViewUserProfile:UIImageView!


@IBAction func IBbtnShowTapped(sender: UIButton)
{
    let lblNameInitialize = UILabel()
    lblNameInitialize.frame.size = CGSize(width: 100.0, height: 100.0)
    lblNameInitialize.textColor = UIColor.whiteColor()
    lblNameInitialize.text = String(IBtxtFieldName.text!.characters.first!) + String(IBtxtFieldSurname.text!.characters.first!)
    lblNameInitialize.textAlignment = NSTextAlignment.Center
    lblNameInitialize.backgroundColor = UIColor.blackColor()
    lblNameInitialize.layer.cornerRadius = 50.0

    UIGraphicsBeginImageContext(lblNameInitialize.frame.size)
    lblNameInitialize.layer.renderInContext(UIGraphicsGetCurrentContext()!)
    IBImgViewUserProfile.image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
}

“SWIFT 3.0”

@IBAction func IBbtnShowTapped(sender: UIButton)
{
    let lblNameInitialize = UILabel()
    lblNameInitialize.frame.size = CGSize(width: 100.0, height: 100.0)
    lblNameInitialize.textColor = UIColor.white
    lblNameInitialize.text = String(IBtxtFieldName.text!.characters.first!) + String(IBtxtFieldSurname.text!.characters.first!)
    lblNameInitialize.textAlignment = NSTextAlignment.center
    lblNameInitialize.backgroundColor = UIColor.black
    lblNameInitialize.layer.cornerRadius = 50.0

    UIGraphicsBeginImageContext(lblNameInitialize.frame.size)
    lblNameInitialize.layer.render(in: UIGraphicsGetCurrentContext()!)
    IBImgViewUserProfile.image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
}