刚开始学习swift语言，学习了网上的多线程构造方式写了一个小demo，源代码如下所示
import UIKit
/*图片总数
*/
let totalImg_COUNT : NSInteger = 20
/*下载图片地址
*/
let downloadImg_URL = "http://img10.360buyimg.com/imgzone/jfs/t2767/272/624097155/382343/b9a734bc/571da504N0e996b41.jpg"
let downloadImg_URL2 = "http://img10.360buyimg.com/imgzone/jfs/t2863/130/1039983507/438543/213230d3/5732c8daN2194ab7d.jpg"
var MainVC : ViewController = ViewController()
/*结构体 暂时不用
*/
//struct SomeStructure {
//
// static var MainVC : ViewController = ViewController()
//}
class ViewController: UIViewController
{
var activityIndicator : UIActivityIndicatorView = UIActivityIndicatorView()
var downloadcountlab : UILabel = UILabel()
var imgview : UIImageView = UIImageView()
var imgcount : NSInteger = 0
override func viewDidLoad() {
super.viewDidLoad()
MainVC = self
self.initview()
let btnnamearr = ["Thread","Operation","GCD","Clear"]
let methodarr = [#selector(testNSThread),#selector(testOperationQueue),#selector(testGCD(_:)),#selector(clear)]
for name in btnnamearr {
let Threadbtn:UIButton = UIButton(type:.System)
let index: Int? = btnnamearr.indexOf(name)
let floatvalue : CGFloat = CGFloat(index!)
Threadbtn.frame=CGRectMake(10,floatvalue * 50 + 100,100,35)
Threadbtn.setTitle(name,forState:UIControlState.Normal) //普通状态下的文字
Threadbtn.setTitle("触摸",forState:UIControlState.Highlighted) //触摸状态下的文字
let method : Selector = methodarr[index!]
Threadbtn.addTarget(self,action:method,forControlEvents:.TouchUpInside)
self.view.addSubview(Threadbtn);
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//1.NSThread 线程
func testNSThread(){
self.clear()
self.showisloading()
for _ in 0 ..< totalImg_COUNT{
/*
手动创建线程
*/
let thread1 = NSThread(target: self,selector: #selector(LoadImage),object: nil)
thread1.name="loading img"
thread1.start()
/*
类方法创建线程
*/
// NSThread.detachNewThreadSelector(#selector(dlBigImage),toTarget: self,withObject: nil)
}
NSLog("thread success")
}
/*
加载图片
*/
func LoadImage(){
/*
时间较长操作
*/
var urlstring:String=String()
if MainVC.imgcount < 2 {
urlstring = downloadImg_URL2
}
else
{
urlstring = downloadImg_URL
}
let data = NSData (contentsOfURL: NSURL (string:urlstring)!)
let img = UIImage (data: data!)
if img != nil{
NSLog("currentThread %@", NSThread.currentThread())
dispatch_async(dispatch_get_main_queue(),{ () -> Void in
self.loadingsuccess(img!)
})
}
}
// 2.NSOperation 队列
func testOperationQueue(){
self.clear()
self.showisloading()
let queue = NSOperationQueue()
queue.maxConcurrentOperationCount = 5 ;
var operations = [MyOperation]()
for _ in 0 ..< totalImg_COUNT {
let myOperation = MyOperation()
myOperation.delegate = self
operations.append(myOperation)
}
queue.addOperations(operations,waitUntilFinished: false)
}
//3.GCD Grand Central Dispatch
func testGCD(button:UIButton){
NSLog("button tag is %d",button.tag)
self.clear()
self.showisloading()
for _ in 0 ..< totalImg_COUNT {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),{ () -> Void in
/*
时间较长操作
*/
var urlstring:String=String()
if MainVC.imgcount < 2 {
urlstring = downloadImg_URL2
}
else
{
urlstring = downloadImg_URL
}
let data = NSData (contentsOfURL: NSURL (string:urlstring)!)
let img = UIImage (data: data!)
if img != nil{
dispatch_async(dispatch_get_main_queue(),{ () -> Void in
self.loadingsuccess(img!)
})
}
})
}
}
/*
初始化视图
*/
func initview()
{
self.imgview.frame=CGRectMake(150,150,100)
self.downloadcountlab.frame=CGRectMake(150,400,100)
self.view.addSubview(self.downloadcountlab)
self.activityIndicator = UIActivityIndicatorView(activityIndicatorStyle:
UIActivityIndicatorViewStyle.Gray)
self.activityIndicator.center = CGPointMake(50,70)
}
/*
清理图片与状态栏
*/
func clear(){
self.downloadcountlab.text = ""
for view in self.view.subviews {
if view .isKindOfClass(UIImageView) {
view.removeFromSuperview()
}
}
self.imgcount = 0
}
/*
正在加载
*/
func showisloading(){
self.activityIndicator.removeFromSuperview()
self.view.addSubview(self.activityIndicator)
self.activityIndicator.startAnimating()
}
/*
加载成功
*/
func loadingsuccess(img:UIImage){
self.imgcount=self.imgcount + 1
self.downloadcountlab.text=String(self.imgcount)
let y :CGFloat = CGFloat(self.imgcount/3*50)
let imgview : UIImageView = UIImageView()
imgview.frame = CGRectMake(150 + CGFloat(self.imgcount%3) * 50.0,50 + y,40,40)
imgview.image = img
self.view.addSubview(imgview)
NSLog("self.imgcount is %d",self.imgcount)
if self.imgcount == totalImg_COUNT {
self.activityIndicator.stopAnimating()
self.activityIndicator.removeFromSuperview()
}
}
}
/*
我的队列类
*/
class MyOperation: NSOperation {
weak var delegate:ViewController?
override func start() {
super.start()
}
override func main(){
/*
时间较长操作
*/
var urlstring:String=String()
if MainVC.imgcount < 2 {
urlstring = downloadImg_URL2
}
else
{
urlstring = downloadImg_URL
}
let data = NSData (contentsOfURL: NSURL (string:urlstring)!)
let img = UIImage (data: data!)
if img != nil{
dispatch_async(dispatch_get_main_queue(),{ () -> Void in
MainVC.loadingsuccess(img!)
})
}
}
}
原文链接：https://www.f2er.com/swift/323790.html