xcode swift 4增加动画数量?
我正在尝试在xcode swift 4增加动画数量?,swift,Swift,我正在尝试在swift 4中设置UILabel数量增加的动画,我对这种语言还是新手,我正在尝试做的是: for index in 1...500 { self.lbl_counter.text = "\(index)" } 值始终为500 我也试过这个 for index in 1...500 { DispatchQueue.main.async{ self.lbl_counter.text = "\(index)" } } 我在这里错过了什么,使它成为增加数字
swift 4
中设置UILabel数量增加的动画,我对这种语言还是新手,我正在尝试做的是:
for index in 1...500 {
self.lbl_counter.text = "\(index)"
}
值始终为500
我也试过这个
for index in 1...500 {
DispatchQueue.main.async{
self.lbl_counter.text = "\(index)"
}
}
我在这里错过了什么,使它成为增加数字的动画
您当前写入的内容将循环的最后一个数字500分配给标签文本,因为在将数字从0设置到500之间没有延迟
for index in 1...500 {
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5 * Double(i) ) {
self.lbl_counter.text = "\(index)"
}
}
//或
尝试以下代码
import UIKit
class ViewController: UIViewController
{
/// Label
private var customLabel : UILabel?
/// MAximum Count to which label will be Updated
private var maxCount : Int?
/// Count which is currently displayed in Label
private var currentCount : Int?
/// Timer To animate label text
private var updateTimer : Timer?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
customLabel = UILabel()
customLabel?.textColor = .black
/// Add label to View
addConstraints()
/// Start Timer
DispatchQueue.main.async {
self.maxCount = 100
self.currentCount = 0
self.updateTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.updateLabel), userInfo: nil, repeats: true)
}
}
@objc func updateLabel() {
self.customLabel?.text = String(currentCount!)
currentCount! += 1
if currentCount! > maxCount! {
/// Release All Values
self.updateTimer?.invalidate()
self.updateTimer = nil
self.maxCount = nil
self.currentCount = nil
}
}
func addConstraints(){
/// Add Required Constraints
self.view.addSubview(customLabel!)
customLabel?.translatesAutoresizingMaskIntoConstraints = false
customLabel?.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 50).isActive = true
customLabel?.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: -50).isActive = true
customLabel?.heightAnchor.constraint(equalToConstant: 50).isActive = true
customLabel?.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 50).isActive = true
}
}
您可以使用定时器在特定时间内增加标签值。这可能与主题无关,但我建议您检查:@AhmadF正是我想要的,谢谢谢谢,但它应该像奖赏硬币一样快。请减少定时器。scheduledTimer(时间间隔:1,时间为0.15,而不是1或更多。如果您希望更改文本值,则时间间隔值取决于计时器回调减少计时器时间,值将以更快的速度更新。)
import UIKit
class ViewController: UIViewController
{
/// Label
private var customLabel : UILabel?
/// MAximum Count to which label will be Updated
private var maxCount : Int?
/// Count which is currently displayed in Label
private var currentCount : Int?
/// Timer To animate label text
private var updateTimer : Timer?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
customLabel = UILabel()
customLabel?.textColor = .black
/// Add label to View
addConstraints()
/// Start Timer
DispatchQueue.main.async {
self.maxCount = 100
self.currentCount = 0
self.updateTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.updateLabel), userInfo: nil, repeats: true)
}
}
@objc func updateLabel() {
self.customLabel?.text = String(currentCount!)
currentCount! += 1
if currentCount! > maxCount! {
/// Release All Values
self.updateTimer?.invalidate()
self.updateTimer = nil
self.maxCount = nil
self.currentCount = nil
}
}
func addConstraints(){
/// Add Required Constraints
self.view.addSubview(customLabel!)
customLabel?.translatesAutoresizingMaskIntoConstraints = false
customLabel?.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 50).isActive = true
customLabel?.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: -50).isActive = true
customLabel?.heightAnchor.constraint(equalToConstant: 50).isActive = true
customLabel?.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 50).isActive = true
}
}