ios - 文本字段中的 addSubview 显示 CGContextSetFillColorWithColor : invalid context 0x0

Question

您好，我尝试在我的文本字段中添加一个名为 typeDeProbleme 的 UIImageView。一切正常，没有显示错误，除了当我尝试点击 typeDeProbleme 时，XCode 在目标输出中给出了这个:

[Unknown process name] CGContextSetFillColorWithColor: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

let imageView = UIImageView()
let image = UIImage(named: "arrow")
imageView.image = image
imageView.frame = CGRect(x: 0, y: 0, width: 25, height: 15)
imageView.contentMode = .scaleAspectFit
typeDeProbleme.rightViewMode = UITextFieldViewMode.always
typeDeProbleme.rightView = imageView
typeDeProbleme.addSubview(imageView)

我已经尝试从中理解 CGContextSetFillColorWithColor: invalid context 0x0但我不能，因为它在 Objective-C 中。因此，我只想知道，我是否遗漏了什么？

Answer 1

试试这个，我想这会对你有帮助...

    let rightView = UIView(frame: CGRect(x: 0, y: 0, width: 25, height: 15))
    let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 25, height: 15))
    imageView.image = UIImage(named: "arrow")
    rightView.addSubview(imageView)

    typeDeProbleme.rightView = rightView
    typeDeProbleme.rightViewMode = .always