［已解决］如何把Object-C中的protocol和delegate转为Swift代码

［问题］

已有OC代码：

MHTabBarController.h

@protocol MHTabBarControllerDelegate;
 
/*
 * A custom tab bar container view controller. It works just like a regular
 * UITabBarController, except the tabs are at the top and look different.
 */
 
@interface MHTabBarController : UIViewController
…...
@end
 
/*
 * The delegate protocol for MHTabBarController.
 */
@protocol MHTabBarControllerDelegate <NSObject>
@optional
- (BOOL)mh_tabBarController:(MHTabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController atIndex:(NSUInteger)index;
- (void)mh_tabBarController:(MHTabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController atIndex:(NSUInteger)index;@end

对应的MHTabBarController.m：

- (void)setSelectedIndex:(NSUInteger)newSelectedIndex animated:(BOOL)animated
{
NSAssert(newSelectedIndex < [self.viewControllers count], @"View controller index out of bounds");
 
if ([self.delegate respondsToSelector:@selector(mh_tabBarController:shouldSelectViewController:atIndex:)]){...}
- (BOOL)mh_tabBarController:(MHTabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController atIndex:(NSUInteger)index
{
NSLog(@"mh_tabBarController %@ shouldSelectViewController %@ at index %u", tabBarController, viewController, index);
 
// Uncomment this to prevent "Tab 3" from being selected.
//return (index != 2);
return YES;
}
 
- (void)mh_tabBarController:(MHTabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController atIndex:(NSUInteger)index
{
NSLog(@"mh_tabBarController %@ didSelectViewController %@ at index %u", tabBarController, viewController, index);}