在 xcode 中以编程方式设置焦点并显示键盘? [英] Set focus and show keyboard programmatically in xcode?

问题描述

这是我的编码，即在单击 UIButton 时以编程方式创建 UITextField.但要增强的是，我想在创建 UITextField 时将焦点(并显示键盘)设置为新的 UITextField.

Here is my coding that UITextField is programmatically created when click on UIButton. But to enhancement is I want to set focus (and show keyboard) to new UITextField when UITextField is being created.

UITextField * txtComp=[[UITextField alloc]initWithFrame:CGRectMake(20,y, 450, 50)];
txtComp.borderStyle=UITextBorderStyleNone;
txtComp.delegate = self;
txtComp.tag=i+1;
txtComp.section=index;
txtComp.placeholder = @"New UITextField";
[txtComp becomeFirstResponder];

以上编码的工作是创建新的 UITextField，但即使设置了 becomeFirstResponder，也根本无法将焦点设置在新的 UITextField 上.

Above coding work as creating new UITextField but cannot be set focus on new UITextField at all even though becomeFirstResponder is set.

推荐答案

-(IBAction)buttonClicked:(id)sender

{

UITextField * txtComp=[[UITextField alloc]initWithFrame:CGRectMake(20,20, 450, 50)];
txtComp.borderStyle=UITextBorderStyleRoundedRect;
txtComp.delegate = self;


txtComp.placeholder = @"New UITextField";
[txtComp becomeFirstResponder];
[self.view addSubview:txtComp];
[self.view bringSubviewToFront:txtComp];

}

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