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集中中央选项卡栏按钮

uitabbar user-interface ios

JasonGenX · 技术社区 · 14 年前

这是怎么做到的?中央标签栏按钮的圆顶效果?这是一个简单的投影圆顶图像顶部的规则中心形状的选项卡按钮?或者还有别的吗?

1 回复 | 直到 14 年前

Midhun MP 14 年前

您可以通过以下方式实现这一点:,

    UIButton* button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(0.0, 0.0, buttonImage.size.width, buttonImage.size.height);
    [button setBackgroundImage:buttonImage forState:UIControlStateNormal];
    [button setBackgroundImage:highlightImage forState:UIControlStateHighlighted];

    CGFloat heightDifference = buttonImage.size.height - self.tabBar.frame.size.height;
    if (heightDifference < 0)
      button.center = self.tabBar.center;
    else
    {
      CGPoint center = self.tabBar.center;
      center.y = center.y - heightDifference/2.0;
      button.center = center;
    }

    [self.view addSubview:button];

请检查以下链接: http://idevrecipes.com/2010/12/16/raised-center-tab-bar-button/

您将在获得完整的源代码 https://github.com/boctor/idev-recipes/tree/master/RaisedCenterTabBar