小编idr*_*mer的帖子

如何使用UIResponder关注激活的UITextField？

代码如下:

//  customTextField.swift
import UIKit
class customTextField: UITextField {

override func becomeFirstResponder() -> Bool {
    if self.tag == 1 {
        self.borderStyle = .Line
        self.superview?.viewWithTag(2)?.resignFirstResponder()
        self.superview?.viewWithTag(3)?.resignFirstResponder()
    } else if self.tag == 2 {
        self.borderStyle = .Line
        self.superview?.viewWithTag(1)?.resignFirstResponder()
        self.superview?.viewWithTag(3)?.resignFirstResponder()            
    } else {
        self.borderStyle = .Line
        self.superview?.viewWithTag(1)?.resignFirstResponder()
        self.superview?.viewWithTag(2)?.resignFirstResponder()
    }
    return true
}
override func resignFirstResponder() -> Bool {
    print("This is called")
    self.borderStyle = .None
    super.resignFirstResponder()
    return true
}}

我想通过View的标签检查哪个textfield是firstResponder.然后,如果其他TextField应该由resignFirstResponder未聚焦.

但是,resignFirstResponder当我在视图中触摸textField时,甚至没有调用becomefirstResponder的代码块.

我正在使用调度组来获取数据字符串。这是一个代码，我不确定为什么要输入Unbalanced call to dispatch_group_leave()此代码。

var queue = DispatchQueue(label: "extractStringQueue", attributes: .concurrent)
queue.async {
  let m_group = DispatchGroup() 
    let weeks = self.weekDataArray 

    for week in weeks {
        for day in week.dayDataArray {
             m_group.enter()
             day.processStringData(dataName, completionHandler: { (data, response, error) in 
                    if true {
                        // Process 
                        m_group.leave()    
                    }
              })
        }
    }

    m_group.notify(queue: queue, execute: {
     // CompletionHandler
    })
}