DKTabPageViewController
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DKTabPageViewController是一个UIViewController的子类，其基于Child ViewController管理多个页面，支持手动滚动，以及是否显示顶部的Tab等。每一个Tab对应一个UIViewController实例，与其他的Tab相互独立，View支持懒加载及viewWillAppear、viewWillDisappear等方法。
简单的接口：
@property (nonatomic, assign) NSInteger selectedIndex;
@property (nonatomic, readonly) UIViewController *selectedViewController;
/**
* Whether show the Tab Bar. Defaults to YES.
*/
@property (nonatomic, assign) BOOL showTabPageBar;
/**
* Whether allow scroll gestures. Defaults to YES.
*/
@property (nonatomic, assign) BOOL gestureScrollEnabled;
/**
* The block to be executed on the page changed.
*/
@property (nonatomic, copy) void (^pageChangedBlock)(NSInteger selectedIndex);
可定制的DKTabPageBar：
@interface DKTabPageBar : UIView
/**
* Height of the tab bar. Defautls to 40.
*/
@property (nonatomic, assign) CGFloat tabBarHeight UI_APPEARANCE_SELECTOR;
/**
* Font of the tab bar. Defautls to [UIFont systemFontOfSize:14].
*/
@property (nonatomic, strong) UIFont *titleFont UI_APPEARANCE_SELECTOR;
/**
* The selection indicator is draw on bottom of the tab bar.
*/
@property (nonatomic, strong) UIView *selectionIndicatorView;
@property(nonatomic, copy) UIColor *backgroundColor UI_APPEARANCE_SELECTOR;
@end
