[英]How to change an image in SWIFT depending on a variable, clicking a button that uses an IF statement
这是一个简单的程序,它创建一个随机数并将其与用户在文本字段中输入的数字进行比较。 这基本上是一个“猜测我举了几根手指?” 程序。
我想要做的是在用户正确猜测时根据“ var randomNumber”在UIImageView中显示图像,以及在用户错误猜测或输入的数字大于5时显示图像(十字)。一开始是一个问号。 从0-5的图像是相应地显示5根手指的图像。
我必须指定这样的图像吗? 我需要写下文件的扩展名吗?
hand.image = UIImage(named: "0")
hand.image = UIImage(named: "1")
hand.image = UIImage(named: "2")
hand.image = UIImage(named: "3")
hand.image = UIImage(named: "4")
hand.image = UIImage(named: "5")
hand.image = UIImage(named: "wrong")
hand.image = UIImage(named: "?")
还是这样?
let image0 = UIImage(named: "0")
let image1 = UIImage(named: "1")
let image2 = UIImage(named: "2")
let image0 = UIImage(named: "3")
let image1 = UIImage(named: "4")
let image2 = UIImage(named: "5")
let image0 = UIImage(named: "wrong")
let image1 = UIImage(named: "?")
我是否需要指定它们?
到目前为止,没有任何工作,如果有人可以帮助,那就太好了。 每次我按“猜测按钮”时,应用程序崩溃。 这是一个相当容易的任务,但是当我刚开始时,我想知道它是如何完成的。 提前致谢。
到目前为止,这是我的代码。
//
// ViewController.swift
// Finger Raten
//
// Created by Daniel Bleyer on 04.07.15.
// Copyright (c) 2015 DiBi. All rights reserved.
//
import UIKit
class ViewController: UIViewController{
@IBOutlet var hand: UIImageView! //image view
@IBOutlet weak var output: UILabel! //result (right/wrong)
@IBOutlet weak var input: UITextField! //guessed number
@IBAction func guess(sender: AnyObject) //guess button (comparing both numbers)
{
var randomNumber = arc4random_uniform(6) //random number
var inputInt = input.text.toInt() //guessed number
hand.image = UIImage(named: "0") //does this code go here? or somewhere else?
hand.image = UIImage(named: "1") //does this code go here? or somewhere else?
hand.image = UIImage(named: "2") //does this code go here? or somewhere else?
hand.image = UIImage(named: "3") //does this code go here? or somewhere else?
hand.image = UIImage(named: "4") //does this code go here? or somewhere else?
hand.image = UIImage(named: "5") //does this code go here? or somewhere else?
hand.image = UIImage(named: "wrong") //does this code go here? or somewhere else?
hand.image = UIImage(named: "?") //does this code go here? is it RIGHT? This image
//shows at the beginning, it is a question mark.
if inputInt != nil && inputInt < 6 //conditions (not empty/0-5)
{
if inputInt == Int(randomNumber) //comparing random/guessed
{
output.text = "Right !"; //right guess
hand.image = UIImage(named: "\(randomNumber)") //image showing 0-5 fingers
//is this the right place?
input.resignFirstResponder(); //hides numpad
} else {
output.text = "Wrong, it was a \(randomNumber)"; //wrong guess, it was a ??
hand.image = UIImage(named: "wrong)") //image of a cross (X)
//is this the right place?
input.resignFirstResponder(); //hides numpad
}
} else {
output.text = "Enter a number from 0-5"; //field empty or out of range
hand.image = UIImage(named: "wrong") //image of a cross (X)
//is this the right place?
input.resignFirstResponder(); //hides numpad
}
}
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.
}
}
我在您的代码中做了一些清理。 这未经测试,但是我想提供一些您未完全正确完成的事情的反馈:何时使用var
/ let
,什么是正确的文件名,不要使用;
等等。请阅读评论。 当您提供崩溃日志时,我将修改此代码-然后我将对其进行测试。
let maxInputInt: Int = 5 // this way you later don't search through the code to change value
override func viewDidLoad() {
super.viewDidLoad()
self.reset()
}
func reset() {
output.text = NSLocalizedString("Enter a number from 0-5", ""); // always provide strings as NSLocalizedString - app is ready to translate in future versions. Without it you'd have to search through all source files
// BTW you should name variables such way so it's obvious what is it, eg inputTextField, output/input is rather wrong
hand.image = UIImage(named: "?")
}
func guess(sender: AnyObject) {
var randomNumber = arc4random_uniform(maxInputInt + 1)
let inputInt = input.text.toInt() // this won't change, should be declared as let not int
let wrongImage = UIImage(named: "wrong")
if inputInt <= maxInputInt { // int is not an object, it cannot be nil, nil is for objects only
if inputInt == Int(randomNumber) {
output.text = NSLocalizedString("Right !", "");
hand.image = UIImage(named: "\(randomNumber)")
} else {
output.text = NSLocalizedString("Wrong, it was a \(randomNumber)", "")
hand.image = wrongImage
}
} else {
hand.image = wrongImage
}
input.resignFirstResponder() // you do it under all conditions, so don't repeat yourself (DRY)
}
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