以編程方式中心UIButton

Question

我有一個UIButton，我以編程方式添加。 這里沒有問題，它應該盡可能地看起來很好看。 但是，當我將手機傾斜到風景時，按鈕會變得不合適，我希望它仍然居中。

肖像：

景觀：

我已經嘗試了很多東西，但似乎無法讓它工作，在我看來，自動化應該照顧它，但是......它在那種情況下不起作用。

- (UIView*)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
    UIView *footerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.tableView.frame.size.width, 49)];

    _notMeButton = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImage *butImage = [[UIImage imageNamed:@"notme.png"] stretchableImageWithLeftCapWidth:6 topCapHeight:6];
    UIImage *butImagePressed = [[UIImage imageNamed:@"KC_notmePressed.png"] stretchableImageWithLeftCapWidth:6 topCapHeight:6];
    [_notMeButton setBackgroundImage:butImage forState:UIControlStateNormal];
    [_notMeButton setBackgroundImage:butImagePressed forState:UIControlStateHighlighted];
    [_notMeButton setTitle:NSLocalizedString(@"Change address", @"KlarnaCheckout") forState:UIControlStateNormal];
    [_notMeButton setTitleColor:[UIColor darkGrayColor] forState:UIControlStateNormal];
    [_notMeButton setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];
    [_notMeButton setTitleShadowColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [_notMeButton.titleLabel setShadowColor:[UIColor whiteColor]];
    [_notMeButton.titleLabel setShadowOffset:CGSizeMake(0, 1)];
    [_notMeButton.titleLabel setFont:[UIFont systemFontOfSize:14]];
    [_notMeButton addTarget:self action:@selector(thisIsNotMe) forControlEvents:UIControlEventTouchUpInside];
    [_notMeButton setTag:1];
    [_notMeButton sizeToFit];
    [_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
    [_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
    [_notMeButton setFrame:CGRectMake(10, 10, _notMeButton.frame.size.width+20, _notMeButton.frame.size.height)];
    [_notMeButton setCenter:footerView.center];

    [footerView addSubview:_notMeButton];

    return footerView;
}

Answer 1

關於自動調整掩碼的想法是對的，但是你設置錯誤：

[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];

第二行會覆蓋您在第一行中設置的內容。 設置幾個標志的正確方法是：

[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin];

Answer 2

在回答你的問題之前有一件事：

[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin];
[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];

第二句覆蓋第一句，你應該使用| 運算符，因此應用了大小調整掩碼：

[_notMeButton setAutoresizingMask:UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin];

要在視圖更改其大小時將元素保持在原位，您需要告訴它不要使用任何大小調整掩碼：

[_notMeButton setAutoresizingMask:UIViewAutoresizingNone];

Interface Builder中的等價物如下：

我希望它有所幫助