ios – 禁用UIAlertView按钮

概述我正在使用一个文本输入的UIAlertView. UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"Save" message:@"Please Enter the Name of PDF" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil 我正在使用一个文本输入的UIAlertVIEw.

UIAlertVIEw *alertVIEw=[[UIAlertVIEw alloc]initWithTitle:@"Save" message:@"Please Enter the name of pdf" delegate:self cancelbuttonTitle:@"Cancel" otherbuttonTitles:@"OK",nil];[alertVIEw setAlertVIEwStyle:UIAlertVIEwStylePlainTextinput]

当UITextFIEld为空时,我想做什么我用代理功能禁用OK按钮

- (BOol)alertVIEwShouldEnableFirstOtherbutton:(UIAlertVIEw *)alertVIEw{return NO;}

当用户开始在文本框中写入某些东西时,OK按钮应该被启用.

解决方法 请尝试这个

- (BOol)alertVIEwShouldEnableFirstOtherbutton:(UIAlertVIEw *)alertVIEw    {        /* RetrIEve a text fIEld at an index -            raises NSRangeException when textFIEldindex is out-of-bounds.         The fIEld at index 0 will be the first text fIEld         (the single fIEld or the login fIEld),The fIEld at index 1 will be the password fIEld. */         /*         1> Get the Text FIEld in alertvIEw         2> Get the text of that Text FIEld         3> Verify that text length         4> return YES or NO Based on the length         */         return [alertVIEw textFIEldAtIndex:0].text.length > 0;    }

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