［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);}

现在需要去：

把OC中的对应的delegate和protocol，尤其是：

shouldSelectViewController

didSelectViewController

实现为对应的Swift版本，并且对应的setSelectedIndex中，要去调用对应的respondsToSelector的shouldSelectViewController

［解决过程］

1.搜：

oc delegate convert to swift

swift delegate protocol

参考：

Converting an Objective-C app to Swift: Working with web data – Tutorial – Binpress

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