The Material Design guidelines recommend picking a color from the
500 level as your primary, a color from the 700 or 800 level as your darker
primary, and a separate accent color.[......]
Material Design推荐颜色选取规则
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iOS如何支持手势返回
传统做法是在viewcontroller上设置navigationController的interactivePopGesturerecovnezer，但是bug很多，推荐如下，在nav controller上的做法：
class C4MVTNavigationController: UINavigationController {
// MARK: - Property
override var supportedInterfaceOrientations: UIIn[......]
iOS中如何获得UITabBarController中每一个tab的具体frame
传送门：http://stackoverflow.com/questions/6325457/getting-the-frame-of-a-particular-tab-bar-item
我稍微改了一下：
- (CGRect)frameForTabInTabBarWithIndex:(NSUInteger)index
{
NSMutableArray *tabBarItems = [NSMutableArray arrayWithCapacity:[self.tabBar.i[......]
iOS的TNV架构下，实现TabBar不旋转，其他页可选旋转
TNV架构下，部分旋转这个功能，实现起来比较蛋疼，给一个目前的方法。
1、自定义TabBar：
extension C4MVTTabBarController: UITabBarControllerDelegate {
func tabBarControllerSupportedInterfaceOrientations(_ tabBarController: UITabBarController) -> UIInterfaceOrientationMask {[......]
苹果官方的iOS UI设计规范
https://developer.apple.com/design/tips/[......]