如何检查文本字段中是否有文本并单击按钮

Question

我有应用程序我希望如果textfield中没有任何数据并且没有单击按钮，则会显示警报视图。否则，它会调用一个方法。我有BOOL isClicked和我已经设置为YES当按钮被点击，但如何检查此和textfield。

BOOL isClicked; 
feedbackTextfield; 
if(isClicked && feedbackTexfield) 

Answer 1

试试这个代码....

if((!isCliked) && ([feedbackTexfield.text length] == 0)) 
    { 
     //button may not clicked or feedbackTextfield not contains text block. 

     //Display your alert stuff 

     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"Button is not clicked" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil]; 
       [alertView show]; 
    } 
    else 
    { 
     //button may clicked or feedbackTextfield contains text block. 
    } 

这是解决你的问题......

Answer 2

if(yourTextField.text.length == 0 && isClicked == FALSE) 
{ 
    // Here goes Alert 
} 
else 
{ 
    // Write your stuff 
}