如何檢查文本字段中是否有文本並單擊按鈕

Question

我有應用程序我希望如果textfield中沒有任何數據並且沒有單擊按鈕，則會顯示警報視圖。否則，它會調用一個方法。我有BOOL isClicked和我已經設置爲YES當按鈕被點擊，但如何檢查此和textfield。

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

Answer 1

試試這個代碼....

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. 
    } 

這是解決你的問題......

Answer 2

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