我正在学习教程，我想稍微扩展一下功能。我目前有一个 View Controller ，允许用户使用 Parse 查询浏览其他用户。当用户在用户图像上滑动时，我希望能够将选定的用户信息发送到新 Controller 。我知道我必须使用 prepareSegue 但我不确定如何将选定的用户信息发送到该 prepareSeque 方法中的变量。
这是 View Controller 。我想发送到 segue 方法的用户在下面的 wasDragged 方法中被标记为“已选择”:
import UIKit
class SwipeViewController: UIViewController {
var xFromCenter: CGFloat = 0
var usernames = [String]()
var userImages = [NSData]()
var currentUser = 0
override func viewDidLoad() {
super.viewDidLoad()
println(PFUser.currentUser()["first_name"])
PFGeoPoint.geoPointForCurrentLocationInBackground { (geopoint: PFGeoPoint!, error: NSError!) -> Void in
println(error)
if error == nil {
println(geopoint)
var user = PFUser.currentUser()
user["location"] = geopoint
var query = PFUser.query()
query.whereKey("location", nearGeoPoint:geopoint)
query.limit = 10
query.findObjectsInBackgroundWithBlock({ (users, error) -> Void in
var accepted = [String]()
if PFUser.currentUser()["accepted"] != nil {
accepted = PFUser.currentUser()["accepted"] as [String]
}
var rejected = [String]()
if PFUser.currentUser()["rejected"] != nil {
rejected = PFUser.currentUser()["rejected"] as [String]
}
for user in users {
var gender1 = user["gender"] as? NSString
var gender2 = PFUser.currentUser()["interestedIn"] as? NSString
if gender1 == gender2 && PFUser.currentUser().username != user.username && !contains(accepted, user.username) && !contains(rejected, user.username) {
self.usernames.append(user.username)
// Update - chaned as to as!
self.userImages.append(user["image"] as NSData)
}
}
var userImage: UIImageView = UIImageView(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height))
println("images:")
println(userImage)
println(self.userImages)
userImage.image = UIImage(data: self.userImages[0])
userImage.contentMode = UIViewContentMode.ScaleAspectFit
self.view.addSubview(userImage)
var gesture = UIPanGestureRecognizer(target: self, action: Selector("wasDragged:"))
userImage.addGestureRecognizer(gesture)
userImage.userInteractionEnabled = true
})
user.save()
}
}
}
func wasDragged(gesture: UIPanGestureRecognizer) {
let translation = gesture.translationInView(self.view)
var label = gesture.view!
xFromCenter += translation.x
var scale = min(100 / abs(xFromCenter), 1)
label.center = CGPoint(x: label.center.x + translation.x, y: label.center.y + translation.y)
gesture.setTranslation(CGPointZero, inView: self.view)
var rotation:CGAffineTransform = CGAffineTransformMakeRotation(xFromCenter / 200)
var stretch:CGAffineTransform = CGAffineTransformScale(rotation, scale, scale)
label.transform = stretch
if label.center.x < 100 {
println("Not Chosen")
PFUser.currentUser().addUniqueObject(self.usernames[self.currentUser], forKey: "rejected")
PFUser.currentUser().save()
self.currentUser++
} else if label.center.x > self.view.bounds.width - 100 {
//SEND THIS USER TO NEW CONTROLLER
println("Chosen")
PFUser.currentUser().addUniqueObject(self.usernames[self.currentUser], forKey: "accepted")
PFUser.currentUser().save()
//self.currentUser++
performSegueWithIdentifier("startGame", sender: nil)
return
}
if gesture.state == UIGestureRecognizerState.Ended {
label.removeFromSuperview()
if self.currentUser < self.userImages.count {
var userImage: UIImageView = UIImageView(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height))
userImage.image = UIImage(data: self.userImages[self.currentUser])
userImage.contentMode = UIViewContentMode.ScaleAspectFit
self.view.addSubview(userImage)
var gesture = UIPanGestureRecognizer(target: self, action: Selector("wasDragged:"))
userImage.addGestureRecognizer(gesture)
userImage.userInteractionEnabled = true
xFromCenter = 0
} else {
println("No more users")
}
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
//var user = ?? I want to send this user info to the segue to GameViewController
let destinationVC = segue.destinationViewController as GameViewController
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
任何帮助将不胜感激。谢谢!
最佳答案
您应该在 GameViewController 类中有一个用户变量，并在您的 prepareForSegue 函数中将其设置为被刷卡的用户。
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "startGame") {
let destinationVC = segue.destinationViewController as GameViewController
destinationVC.user = self.currentUser; //or whatever variables you want to set
}
}
我已经包含了代码来检查 segue 是否是“startGame”segue，以防您想要其他不通过用户的 segue。
关于ios - 如何在 swift 中使用 segue 发送用户信息以查看 Controller ？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29023800/