iOS 8代码可在iPhone 5s上运行，但不能在iPhone 5上运行 [英] iOS 8 Code working on iPhone 5s but not iPhone 5

问题描述

在所有时间都在iPhone 5s模拟器上测试了spritekit游戏之后，我终于尝试在iPhone 5模拟器上运行它.不幸的是，一旦我不了解我的第一触碰，我就会收到一个错误.我的touchesBegan函数调用了我的addCoin函数(见下文)

After testing my spritekit game on the iPhone 5s simulator all the time I finally tried to run it on the iPhone 5 simulator. Unfortunately I get an error as soon as I do the first touch that I don't understand. My touchesBegan function calls my addCoin function (see below)

该代码块中的某个地方有错误.如果我将代码的这一部分注释掉，则其他所有内容都可以正常工作:

The error is somewhere in this code-block. If I comment out this part of the code everything else works fine:

func addCoin()
{
    var coin:SKSpriteNode = SKSpriteNode(texture: coinFrames[0])
    coin.size.width = 50
    coin.size.height = 50
    coin.physicsBody = SKPhysicsBody(circleOfRadius: coin.size.height / 2)
    coin.physicsBody?.dynamic = false
    coin.physicsBody?.allowsRotation = false
    coin.physicsBody?.categoryBitMask = coinCategory
    coin.physicsBody?.contactTestBitMask = playerCategory

    var positionX:CGFloat = CGFloat(Int(arc4random()) % Int(500)) + CGFloat(70.0)
    var positionY:CGFloat = CGFloat(Int(arc4random()) % Int(1007)) + CGFloat(63.0)

    coin.position = CGPointMake(positionX, positionY)        
    coin.runAction(SKAction.repeatActionForever(SKAction.animateWithTextures(coinFrames, timePerFrame: 0.1, resize:false, restore:true)))

    self.addChild(coin)
}

这是发生的错误.如果我将这一行注释掉，则下一行将显示错误...

Here is the error that occurs. If I comment out this line, the next one gives an error...

就像我说的那样，iPhone 5s可以完美运行... 我的代码可能出什么问题了?

Like I said, iPhone 5s works perfectly... What could be wrong with my code?

xCode 6 beta 6& iOS 8 beta 7

xCode 6 beta 6 & iOS 8 beta 7

预先感谢

推荐答案

调试器会误导您.真正的问题是arc4random，它将在iPhone 5和5s上都返回UInt32.但是由于iPhone 5是32位设备，如果随机数足够大，则Int(arc4random())会导致溢出.

The debugger is misleading you. The real problem is arc4random, which will return an UInt32 on both iPhone 5 and 5s. But as iPhone 5 is a 32-bit device, the Int(arc4random()) will cause an overflow if the random number is big enough.

代替使用Int(arc4random())，您可以尝试使用arc4random_uniform替换它.也许下面的代码将为您解决问题.

Instead of using Int(arc4random()), you can try to replace it by using arc4random_uniform. Maybe the code below will do the trick for you.

var positionX: CGFloat = CGFloat(arc4random_uniform(500)) + CGFloat(70.0)
var positionY: CGFloat = CGFloat(arc4random_uniform(1007)) + CGFloat(63.0)

这篇关于iOS 8代码可在iPhone 5s上运行，但不能在iPhone 5上运行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！