Swift 在UIAlertViewDelegate中的索引处单击的按钮未被调用
在Objective-C的前面部分,我们在Swift 在UIAlertViewDelegate中的索引处单击的按钮未被调用,swift,Swift,在Objective-C的前面部分,我们在UIAlertView中使用了delegate:self,这样我们就可以调用像在索引处单击按钮这样的方法……但现在在swift中,我在哪里设置该委托?因为没有调用我在索引方法上单击的按钮 import UIKit class ViewController:UIViewController,UITableViewDelegate,UITableViewDataSource,UIAlertViewDelegate{ override func viewD
UIAlertView
中使用了delegate:self,这样我们就可以调用像在索引处单击按钮这样的方法……但现在在swift中,我在哪里设置该委托?因为没有调用我在索引方法上单击的按钮
import UIKit
class ViewController:UIViewController,UITableViewDelegate,UITableViewDataSource,UIAlertViewDelegate{
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!{
let cell :UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: nil)
cell.text = "HI \(indexPath.row)"
cell.detailTextLabel.text = "SWIFT"
return cell
}
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int
{
return 5
}
func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!)
{
var alert = UIAlertController(title: "Demo", message: "You have selected row number\(indexPath.row)", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler: nil))
alert.addAction(UIAlertAction(title: "KILL", style: UIAlertActionStyle.Destructive, handler: nil))
alert.addAction(UIAlertAction(title: "PUNE", style: UIAlertActionStyle.Default, handler: nil))
alert.addAction(UIAlertAction(title: "Mumbai", style: UIAlertActionStyle.Default, handler: nil))
alert.addAction(UIAlertAction(title: "Kolkata", style: UIAlertActionStyle.Default, handler: nil))
alert.addAction(UIAlertAction(title: "Chennai", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
func demoFunction (myName:NSString)
{
NSLog("%@", "swapnil")
}
func alertView(alertView: UIAlertView!, clickedButtonAtIndex buttonIndex: Int)
{
NSLog("%@", "YOU PRESSED OK" )
switch (buttonIndex)
{
case 0:NSLog("%@", "YOU PRESSED OK" )
case 1:NSLog("%@", "YOU PRESSED KILLER" )
case 2:NSLog("%@", "YOU PRESSED PUNE" )
case 3:NSLog("%@", "YOU PRESSED MUMBAI" )
case 4:NSLog("%@", "YOU PRESSED KOLKATA" )
case 5:NSLog("%@", "YOU PRESSED Chennai" )
default :NSLog("%@", "You have pressed default")
}
}
}
UIAlertController
未实现委托属性。它使用处理程序参数-addAction:
来处理点击按钮的操作。下面是一个如何实现这一点的示例:
alert.addAction(UIAlertAction(title: "RandomTitle", style: UIAlertActionStyle.Default, handler:{(alert :UIAlertAction!) -> void in
//Handle action here.
//You can also use the alert title property to differentiate between
//UIAlertActions and hand the same closure in to each one. E.i.
if(action.title == "first option"){
//handle when the user taps the "first option" button.
}
}))
您不应该使用委托方法,事实上,
UIAlertController
不提供委托
在您的情况下,您的警报操作应如下所示:
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: {(alert :UIAlertAction!) in
println("YOU PRESSED OK")
}))
每一个动作都是如此 请您解释一下(alert:UIAlertAction!)我们为什么使用!最后在这里进行手术