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gcd的封装(swift)

时间:2015-07-05 12:28:43      阅读:151      评论:0      收藏:0      [点我收藏+]

标签:ios   swift   gcd   

gcd的封装(swift)

by 伍雪颖

override func viewDidLoad() {
   
delay(2) {
       
println("2s later")
    }
   
let task = delay(5) {
       
println("call")
    }
   
cancel(task)
}

typealias Task = (cancel : Bool) -> ()
func delay(time:NSTimeInterval,task:()->()) -> Task? {
   
func dispatch_later(block:() -> ()) {
       
dispatch_after(
           
dispatch_time(
           
DISPATCH_TIME_NOW,
           
Int64(time * Double(NSEC_PER_SEC))),
           
dispatch_get_main_queue(),
            block)
    }
   
var closure: dispatch_block_t? = task
   
var result: Task?
   
   
let delayedClosure: Task = {
        cancel
in
       
if let internalClosure = closure {
           
if (cancel == false) {
               
dispatch_async(dispatch_get_main_queue(), internalClosure);
            }
        }
        closure =
nil
        result =
nil
    }
   
    result = delayedClosure
   
   
dispatch_later {
       
if let delayedClosure = result {
            delayedClosure(cancel:
false)
        }
    }
   
return result;
}

func cancel(task:Task?) {
    task?(cancel:
true)
}

版权声明:本文为博主原创文章,未经博主允许不得转载。

gcd的封装(swift)

标签:ios   swift   gcd   

原文地址:http://blog.csdn.net/rainlesvio/article/details/46762095

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