Question

我想一个接一个地添加按钮。我有这个简单的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];

    for(int i=0 ; i<9 ; i++)
    {
        UIButton *myButton = [[UIButton alloc] init];
        myButton.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height/10); //this "10" i want also dynamically
        myButton.backgroundColor = [UIColor blackColor];
        [self.view addSubview:myButton];
    }

}

当然，我知道它会相互吸引。但是我可以在循环中不知道高度（因为高将取决于循环中有多少按钮）。

我想要实现的目标：

Buttons

Answer 1

试试这个：

- (void)viewDidLoad
  {
    [super viewDidLoad];
    int number = 10;

     for(int i=0 ; i<9 ; i++)
    {
    UIButton *myButton = [[UIButton alloc] init];
    myButton.frame = CGRectMake(self.view.frame.origin.x, (self.view.frame.size.height/number)*i + number, self.view.frame.size.width, self.view.frame.size.height/number);
    myButton.backgroundColor = [UIColor blackColor];
    [self.view addSubview:myButton];
    }


}

Answer 2

也许这可行吗？对不起，我已经很久没有使用self.view.frame了，但是你得到了一般的想法。

- (void)viewDidLoad
{
    [super viewDidLoad];
    int number;

    for(int i=0 ; i<9 ; i++)
    {
        UIButton *myButton = [[UIButton alloc] init];
        myButton.frame = CGRectMake(i * self.view.frame.origin.x / number,
                                    self.view.frame.origin.y,
                                    self.view.frame.size.width,
                                    self.view.frame.size.height / number); //this "10" i want also dynamically
        myButton.backgroundColor = [UIColor blackColor];
        [self.view addSubview:myButton];
    }
}

Answer 3

你需要为正确的节目定义按钮的大小，遗憾的是没有你想要的按钮大小因为系统知道你的大小按钮是怎么回事我想表明......？

- (void)viewDidLoad
{
    [super viewDidLoad];

    Float32 _spaceBetweenButtons = 8.f;
    Float32 _offsetY = 32.f;
    Float32 _buttonWidth = 300.f; // width fo button
    Float32 _buttonHeight = 32.f; // height of the button

    for (int i = 0 ; i < 9 ; i++) {
        UIButton *_myButton = [[UIButton alloc] initWithFrame:CGRectMake(0.f, 0.f, _buttonWidth, _buttonHeight)];
        [_myButton setBackgroundColor:[UIColor blackColor]];
        [_myButton setTitle:[NSString stringWithFormat:@"button #%d", i] forState:UIControlStateNormal]; // just add some text as title
        [self.view addSubview:_myButton];
        [_mybutton setCenter:CGPointMake(self.view.frame.size.width / 2.f, _offsetY + i * (myButton.frame.size.height + _spaceBetweenButtons))];
    }
}

如果你想动态计算按钮的大小，并且想要将按钮的高度与视图的高度对齐，这将是一种方式：

NSInteger _numberOfButtons = 20;
Float32 _spaceBetweenButtons = 8.f;
Float32 _calculatedHeight = (self.view.frame.size.height - (_numberOfButtons + 1 * _spaceBetweenButtons)) / _numberOfButtons;

并且方法与上面相同，但我不确定在数百个按钮的情况下你会获得良好的UI。：）

在另一个下方添加按钮

3 个答案: