iOS ARC UIAlertView泄漏內存

Question

我有簡單的方法顯示AlertView與文本字段。儀器顯示內存泄漏。請解釋。

- (void)method { 
NSString *value = [[NSUserDefaults standardUserDefaults] valueForKey:@"key"]; 
if (value == nil) { 

    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Title" message:@"message" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 

    alertView.tag = 101; 
    alertView.alertViewStyle = UIAlertViewStylePlainTextInput; 
    UITextField *txtGroup = [alertView textFieldAtIndex:0]; 
    [txtGroup becomeFirstResponder]; 

    [alertView show]; 
    alertView = nil; 
} 
} 

請找到工具的截圖：

Answer 1

您需要創建alertView爲：

static UIAlertView *alertView = nil; 

if (!alertView){ 
    alertView = [[UIAlertView alloc] initWithTitle:@"Title" message:@"message" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
}