ios - 字符串(格式 :) Crashes in iOS 7 - Need an alternative. 线程 1 : EXC_BAD_ACCESS (code=1, 地址=0x10)

Question

String(format:) 方法使我的应用程序在 iOS 7 中崩溃，但它在 iOS 8 中运行良好。有什么我可以用来在此处获得相同效果的方法吗？

我收到的错误消息是:THREAD 1: EXC_BAD_ACCESS (code=1, address=0x20)只有 (lldb)在控制台中。

我在所有 7.1 模拟器设备和 iPhone 4 7.1.2 设备上遇到此错误。

func configureLoadingIcon() {
    loadingImage.alpha = 0.0
    loadingImage.animationImages = [UIImage]()
    for var index = 0; index < 48; index++ {

        // Need an alternative to this line
        var frameName = String(format: "loading_%05d", index)

        loadingImage.animationImages?.append(UIImage(named: frameName)!)
    }
    loadingImage.animationDuration = 1.3
    loadingImage.startAnimating()
}

//编辑

我现在正在做这个......但在 iOS 7 上仍然没有乐趣......

func configureLoadingIcon() {
    loadingImage.alpha = 0.0
    loadingImage.animationImages = [UIImage]()
    var frameName: String
    for var i = 0; i < 48; i++ {
        let formatter = NSNumberFormatter()
        formatter.minimumIntegerDigits = 2
        let formattedIndex = formatter.stringFromNumber(i)
        var frameName = String(format: "loading_000%@", formattedIndex!)
        loadingImage.animationImages?.append(UIImage(named: frameName)!)
    }
    loadingImage.animationDuration = 1.3
    loadingImage.startAnimating()
}

我也试过var frameName = "loading_000\(formattedIndex)"但这似乎不起作用.. 不确定为什么。

Answer 1

var frameName = "loading_000\(formattedIndex!)" 是唯一可行的选择。

func configureLoadingIcon() {
    loadingImage.alpha = 0.0
    loadingImage.animationImages = [UIImage]()
    var frameName: String
    for var i = 0; i < 48; i++ {
        let formatter = NSNumberFormatter()
        formatter.minimumIntegerDigits = 2
        let formattedIndex = formatter.stringFromNumber(i)
        var frameName = "loading_000\(formattedIndex!)"
        loadingImage.animationImages?.append(UIImage(named: frameName)!)
    }
    loadingImage.animationDuration = 1.3
    loadingImage.startAnimating()
}