Ios 消除强制展开的最佳方法
如何移除强制展开?第一个可以使用Ios 消除强制展开的最佳方法,ios,swift,optional,forceunwrap,Ios,Swift,Optional,Forceunwrap,如何移除强制展开?第一个可以使用if let(或者guard let)处理的方法: 在第二个示例中,我将使用默认值: if let recorder = recorder { // here it is unwrapped } else { // handle nil case } 但是,我看到您已经在第二种情况下使用了if let,因此您不需要它。因此,我认为最好使用,如果让这两种情况都使用,那么可能是这样的: if (recorder?.isRunning() ?? fal
if let
(或者guard let
)处理的方法:
在第二个示例中,我将使用默认值:
if let recorder = recorder {
// here it is unwrapped
} else {
// handle nil case
}
但是,我看到您已经在第二种情况下使用了if let
,因此您不需要它。因此,我认为最好使用,如果让这两种情况都使用,那么可能是这样的:
if (recorder?.isRunning() ?? false) {
// ...
}
或者,正如@Fogmaster所指出的,在第二种方法中使用guard
,看起来会更好一些:
var recorder : Recorder? = nil
func startAudioRecording(){
if recorder == nil {
recorder = Recorder()
}
if let recorder = recorder,
!recorder.isRunning() {
recorder.startRecording({ [weak self] audioData in
self?.remoteInterface?.sendVoice(audioData.0)
}, withCompletionBlock: { (_) in })
}
}
func stopAudioRecording(_ keyCommand: String!){
if let recorder = recorder,
recorder.isRunning() {
recorder.stopRecording(completionBlock: { (isFinished: Bool) in
DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + Double(Int64(1 * NSEC_PER_MSEC)) / Double(NSEC_PER_SEC), execute: { [unowned self] in
self.remoteInterface?.sendTouchUp(keyCommand)
self.audioRecorder = nil
})
})
}
}
你可以把recorder
改为懒惰
func stopAudioRecording(_ keyCommand: String!){
guard let recorder = recorder,
recorder.isRunning() else {
return
}
recorder.stopRecording(completionBlock: { (isFinished: Bool) in
DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + Double(Int64(1 * NSEC_PER_MSEC)) / Double(NSEC_PER_SEC), execute: { [unowned self] in
self.remoteInterface?.sendTouchUp(keyCommand)
self.audioRecorder = nil
})
})
}
我会将第二个函数更改为使用guard
,而不是if
。有助于减少压痕,使外观更美观。
func stopAudioRecording(_ keyCommand: String!){
guard let recorder = recorder,
recorder.isRunning() else {
return
}
recorder.stopRecording(completionBlock: { (isFinished: Bool) in
DispatchQueue.global().asyncAfter(deadline: DispatchTime.now() + Double(Int64(1 * NSEC_PER_MSEC)) / Double(NSEC_PER_SEC), execute: { [unowned self] in
self.remoteInterface?.sendTouchUp(keyCommand)
self.audioRecorder = nil
})
})
}
var recorder: Recorder = {
return Recorder()
}()