本文介绍了迅速和布尔的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
函数AUGraphIsInitialized的定义如下:
The function AUGraphIsInitialized is defined like this:
func AUGraphIsInitialized(inGraph: AUGraph, outIsInitialized: CMutablePointer<Boolean>) -> OSStatus所以,您这样称呼它:
var status : OSStatus = OSStatus(noErr) var outIsInitialized:Boolean = 0 status = AUGraphIsInitialized(self.processingGraph, &outIsInitialized)可以。但是如何检查呢?
That works. But how do you check it?
布尔值定义为CUnsignedChar(在MacTypes.h中)
Boolean is defined as an CUnsignedChar (in MacTypes.h)
因此,则无法执行以下操作:
So, you cannot do this:
if outIsInitialized { // whatever }并且您无法投射它(找不到重载...)
And you cannot cast it (could not find an overload...)
var b:Bool = Bool(outIsInitialized)或使用Swift的 as
or with Swift's "as"
var b:Bool = outIsInitialized as Bool所以,我的问题是:如何在Swift中使用布尔值?
So, my question is: how do you use Boolean in Swift?
推荐答案C表示布尔值true(具有非零值)和false(具有零值),因此您可以针对测试 outIsInitialized 0 :
C represents the Boolean value true with a nonzero value and false with a zero value, so you can just test outIsInitialized against 0:
if outIsInitialized != 0 { // outIsInitialized is true }更多推荐
迅速和布尔
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