獲取此警告：不兼容的指針類型初始化'*'與類型爲'*'的表達式

Question

我收到此警告，但沒有線索我做錯了什麼，它是一個簡單的代碼來更改視圖與轉換。我沒有使用Xcode 3.x中的這個錯誤，但現在使用4.x時，問題開始了。儘管這只是一個警告，代碼編譯完美，但我想知道問題所在。

-(IBAction)swapViews:(id)sender{ 
DemoViewController *view3 = [[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil]; 
view3.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 
[self presentModalViewController:view3 animated:YES];} 

感謝所有您的幫助

Answer 1

//DemoViewController* ThirdViewController* ???? 
//the warning is in this line 
DemoViewController *view3 = [[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil]; 
view3.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 
[self presentModalViewController:view3 animated:YES]; 

我想你想在這裏做的是什麼。

ThirdViewController *view3 = [[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil]; 

Answer 2

你忘了大括號嗎？

-(IBAction)swapViews:(id)sender { 
    DemoViewController *view3 = [[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil]; 
    view3.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 
    [self presentModalViewController:view3 animated:YES]; 
}