Fix indentation & change inner-func to closure.
Fix indentation & change inner-func to closure.

msdgwzhy6/SwiftTask,luzefeng/SwiftTask,luzefeng/SwiftTask,marinehero/SwiftTask,iosyoujian/SwiftTask,iosyoujian/SwiftTask,iosyoujian/SwiftTask,iosyoujian/SwiftTask,ReactKit/SwiftTask,luzefeng/SwiftTask,marinehero/SwiftTask,ReactKit/SwiftTask,marinehero/SwiftTask,msdgwzhy6/SwiftTask,ReactKit/SwiftTask,marinehero/SwiftTask,msdgwzhy6/SwiftTask,luzefeng/SwiftTask,msdgwzhy6/SwiftTask