iphone - 如何在带有对齐中心的uiview中并排放置按钮

Question

我有一个 uiview，我必须以编程方式在 uiview 的中心并排放置几个按钮，如图所示

类似这个图，按钮应该放在uiview的中心

 --------------------------------
| ----     ----      ----        |
||    |   |    |    |    |       |
|| 1B |   | 3B |    | 5B |       |
| ----     ----      ----        |
| ----     ----                  |
|| 2B |   |    |                 |
||    |   | 4B |                 |
| ----     ----                  |
 --------------------------------

Answer 1

这是我已经解决的问题。 Source Code

一个枚举类型，表示你想要垂直或水平排列的项目

typedef enum {
    ArrangementTypeHorz = 1,
    ArrangementTypeVert = 2
}ArrangementType;

声明数字或行列和排列类型

@interface ATTViewController ()

{
    ArrangementType _arrangementType;

    NSUInteger _rows;
    NSUInteger _columns;

}

@end

方法计算 item index wrt superView 的框架

- (CGRect)frameForItemAtIndex:(NSUInteger)index inSuperView:(UIView *)superView
{
    CGFloat blockWidth  = floorf(superView.frame.size.width/_columns);
    CGFloat blockHeight = floorf(superView.frame.size.height/_rows);

    NSUInteger row    = 0;
    NSUInteger column = 0;

    if (_arrangementType == ArrangementTypeHorz) {
        row    = floorf((CGFloat)index/_columns);
        column = index - row*_columns;
    }else{
        column    = floorf((CGFloat)index/_rows);
        row = index - column*_rows;
    }

    CGFloat xOffset = 5.0f;
    CGFloat yOffset = 5.0f;

    return  CGRectMake(blockWidth*column+xOffset,
                       blockHeight*row+yOffset,
                       blockWidth-(2*xOffset),
                       blockHeight-(2*yOffset));
}

将按钮添加到 containerView。添加时设置行、列和排列类型

- (void)addButtonsToContainerView
{
    NSUInteger numberOfItems = 5;

    _rows = 2;
    _columns = 3;

    _arrangementType = ArrangementTypeVert;

    NSUInteger itemCount = 0;

    while (itemCount<numberOfItems)
    {
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        CGRect frame = [self frameForItemAtIndex:itemCount inSuperView:self.containerView];
        [button setFrame:frame];
        NSString *title = [NSString stringWithFormat:@"Button %d",itemCount+1];
        [button setTitle:title forState:UIControlStateNormal];

        [self.containerView addSubview:button];

        itemCount ++;
    }
}