iphone - 为什么我的 UIButton 没有显示？

Question

这是我正在使用的代码:

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];

然而，对接并未显示。有什么想法吗？

Answer 1

你初始化错误。尝试以下操作:

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];