Swift之一个简单方法测试方法的执行的耗时

 
 
import UIKit
 
 
class ViewController: UIViewController {
 
 
override func viewDidLoad() {
    super.viewDidLoad()
    
    getTime { () -> () in
        doSomething()
    }
}
/**测量一个方法的执行用时*/
func getTime(function:()->()){
    let start=CACurrentMediaTime()
    function()
    let end=CACurrentMediaTime()
    print("方法耗时为：\(end-start)")
}
 
 
}
 /*某个耗时方法/
 func doSomething(){
 let array=NSMutableArray()
 for i in 1...20000000{
 array.addObject(i)
 }
 }