如何在 if 条件下对所有检查 UITextField 执行检查 [英] How can I perform a check on all check UITextField's in if condition

问题描述

我一直在寻找解决方案，但目前还没有找到，请参考这个，我想知道是否有一种方法可以对所有 UITextField 执行检查，而不是使用硬编码值，谢谢您的帮助.

I have been looking out for solutions but haven't found one so far, please refer to the answer to this, i want to know if there is a way i can perform the check on all UITextFields, instead of having a hard coded value, thanks for help.

推荐答案

首先确保所有 textField 的委托都设置为 self(意味着您的 viewController)

first your make sure that all textField have their delegate set to self ( means your viewController)

 Ex. [myTextField setDelegate:self];// you can also set the delegate in Storyboard or xib directly 

然后在类实现中添加一个实例变量，例如 -

Then add a instance variable in your class implementation like -

@implementation myViewController 
{ 
   UITextField *activeField; 
}

然后简单地实现如下方法

and then simply implement the method as below

在你的 textFieldShouldBeginEditing 中，设置 activeField

in your textFieldShouldBeginEditing, set activeField

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    activeField = textField; // HERE get reference of your active field
    return true;
}

为所有处理提供了一个非常好的方法

There is a very nice method provided for all handling

CGRectContainsRect

CGRectContainsRect

 if (!CGRectContainsRect(viewableAreaFrame, activeTextFieldFrame))
 {
     /*Scroll or move view up*/
 } 

在您的 keyboardWillShow 方法中实现以下

Implement below in your keyboardWillShow method

前.

 - (void)keyboardWillShow:(NSNotification *)notification
    {
        CGSize keyboardSize = [[[notification userInfo]      objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

float viewWidth = self.view.frame.size.width;
float viewHeight = self.view.frame.size.height;


CGRect viewableAreaFrame = CGRectMake(0.0, 0.0, viewWidth, viewHeight - keyboardHeight);

CGRect activeTextFieldFrame = [activeTextField frame];

        if (!CGRectContainsRect(viewableAreaFrame, activeTextFieldFrame))
        {
                 /*Scroll or move view up*/

            [UIView animateWithDuration:0.3 animations:^{
                CGRect f = self.view.frame;
                f.origin.y = -keyboardSize.height;
                self.view.frame = f;
            }];
        }

    }

这篇关于如何在 if 条件下对所有检查 UITextField 执行检查的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！