爲什麼我的UIButton不顯示？

Question

這是我使用的代碼：

UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(100, 200, 50, 70)]; 
    [self.view addSubview:button]; 
    if (buttonArray == nil) { 
     buttonArray = [[NSMutableArray alloc] init]; 
    } 
    [buttonArray addObject:button]; 
    [button release]; 

的對接不顯示，但是。任何想法爲什麼？

Answer 1

您正在初始化錯誤。嘗試以下操作：

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
button.frame = CGRectMake(100, 200, 50, 70); 
[self.view addSubview:button]; 
if (buttonArray == nil) { 
    buttonArray = [[NSMutableArray alloc] init]; 
} 
[buttonArray addObject:button];