我正在尝试使用示例中的<->运算符进行简单的双向绑定。
import UIKit
import RxSwift
import RxCocoa
class ViewController: UIViewController {
let textview = UITextView()
let testVar = Variable("")
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(textview)
textview.frame = view.bounds
textview.backgroundColor = UIColor.whiteColor()
textview.rx_text <-> testVar
}
}
infix operator <-> {
}
func <-> <T>(property: ControlProperty<T>, variable: Variable<T>) -> Disposable {
let bindToUIDisposable = variable.asObservable()
.bindTo(property)
let bindToVariable = property
.subscribe(onNext: { n in
variable.value = n
}, onCompleted: {
bindToUIDisposable.dispose()
})
return StableCompositeDisposable.create(bindToUIDisposable, bindToVariable)
}
编辑此文本视图会导致异常，我不确定如何解决它。
2016-02-29 18:44:23.322 TestRX[71117:38702571] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[NSLayoutManager _fillLayoutHoleForCharacterRange:desiredNumberOfLines:isSoft:] *** attempted layout while textStorage is editing. It is not valid to cause the layoutManager to do layout while the textStorage is editing (ie the textStorage has been sent a beginEditing message without a matching endEditing.)'
*** First throw call stack:
(
0 CoreFoundation 0x000000010cd64e65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010eaa4deb objc_exception_throw + 48
2 CoreFoundation 0x000000010cd64d9d +[NSException raise:format:] + 205
3 UIFoundation 0x000000011444636e -[NSLayoutManager(NSPrivate) _fillLayoutHoleForCharacterRange:desiredNumberOfLines:isSoft:] + 531
4 UIFoundation 0x000000011444da73 _NSFastFillAllLayoutHolesForGlyphRange + 1467
5 UIFoundation 0x000000011444b01a -[NSLayoutManager(NSPrivate) _rectArrayForRange:withinSelectionRange:rangeIsCharRange:singleRectOnly:fullLineRectsOnly:inTextContainer:rectCount:rangeWithinContainer:glyphsDrawOutsideLines:rectArray:rectArrayCapacity:] + 822
6 UIFoundation 0x000000011444e488 -[NSLayoutManager(NSPrivate) _rectArrayForRange:withinSelectionRange:rangeIsCharRange:singleRectOnly:fullLineRectsOnly:inTextContainer:rectCount:rangeWithinContainer:glyphsDrawOutsideLines:] + 117
7 UIFoundation 0x0000000114486f42 -[NSLayoutManager rectArrayForCharacterRange:withinSelectedCharacterRange:inTextContainer:rectCount:] + 80
8 UIKit 0x000000010df3a801 -[_UITextContainerView updateInsertionPointStateAndRestartTimer:] + 311
9 UIFoundation 0x0000000114452daf -[NSLayoutManager(NSPrivate) _invalidateLayoutForExtendedCharacterRange:isSoft:invalidateUsage:] + 2118
10 UIKit 0x000000010df23a98 -[UITextView setAttributedText:] + 950
11 UIKit 0x000000010df2bc95 -[UITextView setText:] + 188
12 RxCocoa 0x000000010c805fc7 _TFFE7RxCocoaCSo10UITextViewg7rx_textGVS_15ControlPropertySS_U0_FTS0_SS_T_ + 119
13 RxCocoa 0x000000010c806027 _TTRXFo_oCSo10UITextViewoSS_dT__XFo_oS_iSS_dT__ + 55
14 RxCocoa 0x000000010c7f300b _TFC7RxCocoa17UIBindingObserver2onu0_Rq_Ss9AnyObject_fGS0_q_q0__FGO7RxSwift5Eventq0__T_ + 747
15 RxCocoa 0x000000010c7f342f _TTWu0_Rq_Ss9AnyObject_GC7RxCocoa17UIBindingObserverq_q0__7RxSwift12ObserverTypeS0_FS3_2onuRq_S3__fq_FGOS2_5Eventqq_S3_1E_T_ + 63
16 RxSwift 0x000000010c8fbd31 _TPA + 113
17 RxSwift 0x000000010c8fb933 _TFV7RxSwift11AnyObserver2onurfGS0_q__FGOS_5Eventq__T_ + 387
18 RxCocoa 0x000000010c7ac198 _TFV7RxCocoa15ControlProperty2onurfGS0_q__FGO7RxSwift5Eventq__T_ + 1000
19 RxCocoa 0x000000010c7ac56c _TTWurGV7RxCocoa15ControlPropertyq__7RxSwift12ObserverTypeS_FS2_2onuRq_S2__fq_FGOS1_5Eventqq_S2_1E_T_ + 92
20 RxSwift 0x000000010c8fbd31 _TPA + 113
21 RxSwift 0x000000010c8fb933 _TFV7RxSwift11AnyObserver2onurfGS0_q__FGOS_5Eventq__T_ + 387
22 RxSwift 0x000000010c8fba44 _TTWurGV7RxSwift11AnyObserverq__S_12ObserverTypeS_FS1_2onuRq_S1__fq_FGOS_5Eventqq_S1_1E_T_ + 68
23 RxSwift 0x000000010c903e35 _TFeRq_7RxSwift12ObserverType_S_VS_3Bag2onuRq_S0__fGS1_q__FGOS_5Eventqq_S0_1E_T_ + 1141
24 RxSwift 0x000000010c90dbb3 _TFC7RxSwift15BehaviorSubject16_synchronized_onurfGS0_q__FGOS_5Eventq__T_ + 3747
25 RxSwift 0x000000010c90cc7c _TFC7RxSwift15BehaviorSubject2onurfGS0_q__FGOS_5Eventq__T_ + 380
26 RxSwift 0x000000010ca0fbfd _TFC7RxSwift8Variables5valueq_ + 365
27 TestRX 0x000000010c6fcc0b _TFZF6TestRXoi3lsgurFTGV7RxCocoa15ControlPropertyq__GC7RxSwift8Variableq___PS2_10Disposable_U_FQ_T_ + 91
28 TestRX 0x000000010c6fcc58 _TTRGrXFo_iq__dT__XFo_iq__iT__ + 24
29 TestRX 0x000000010c6fc8b1 _TPA__TTRGrXFo_iq__dT__XFo_iq__iT__ + 97
30 RxSwift 0x000000010c991ec4 _TFFeRq_7RxSwift14ObservableType_S_S0_9subscribeuRq_S0__Fq_FT6onNextGSqFqq_S0_1ET__7onErrorGSqFPSs9ErrorType_T__11onCompletedGSqFT_T__10onDisposedGSqFT_T___PS_10Disposable_U_FGOS_5EventQQPS0_1E_T_ + 772
31 RxSwift 0x000000010c9911ec _TPA__TFFeRq_7RxSwift14ObservableType_S_S0_9subscribeuRq_S0__Fq_FT6onNextGSqFqq_S0_1ET__7onErrorGSqFPSs9ErrorType_T__11onCompletedGSqFT_T__10onDisposedGSqFT_T___PS_10Disposable_U_FGOS_5EventQQPS0_1E_T_ + 284
32 RxSwift 0x000000010c8fb368 _TFC7RxSwift17AnonymousObserver6onCoreurfGS0_q__FGOS_5Eventq__T_ + 392
33 RxSwift 0x000000010c9a03ae _TFC7RxSwift12ObserverBase2onurfGS0_q__FGOS_5Eventq__T_ + 974
34 RxSwift 0x000000010c9a094f _TTWurGC7RxSwift12ObserverBaseq__S_12ObserverTypeS_FS1_2onuRq_S1__fq_FGOS_5Eventqq_S1_1E_T_ + 63
35 RxSwift 0x000000010c9e2121 _TFC7RxSwift4Sink9forwardOnuRq_S_12ObserverType_fGS0_q__FGOS_5Eventqq_S1_1E_T_ + 625
36 RxSwift 0x000000010c9ed4af _TFC7RxSwift15SubscribeOnSink2onu0_Rq_S_14ObservableTypeq0_S_12ObserverTypezqq_S1_1Eqq0_S2_1E_fGS0_q_q0__FGOS_5Eventqq_S1_1E_T_ + 463
37 RxSwift 0x000000010c9ede13 _TTWu0_Rq_7RxSwift14ObservableTypeq0_S_12ObserverTypezqq_S0_1Eqq0_S1_1E_GCS_15SubscribeOnSinkq_q0__S1_S_FS1_2onuRq_S1__fq_FGOS_5Eventqq_S1_1E_T_ + 83
38 RxSwift 0x000000010c9e2121 _TFC7RxSwift4Sink9forwardOnuRq_S_12ObserverType_fGS0_q__FGOS_5Eventqq_S1_1E_T_ + 625
39 RxSwift 0x000000010c9684bf _TFC7RxSwift12DeferredSink2onu0_Rq_S_14ObservableTypeq0_S_12ObserverTypezqq_S1_1Eqq0_S2_1E_fGS0_q_q0__FGOS_5Eventqq_S1_1E_T_ + 463
40 RxSwift 0x000000010c9688c3 _TTWu0_Rq_7RxSwift14ObservableTypeq0_S_12ObserverTypezqq_S0_1Eqq0_S1_1E_GCS_12DeferredSinkq_q0__S1_S_FS1_2onuRq_S1__fq_FGOS_5Eventqq_S1_1E_T_ + 83
41 RxSwift 0x000000010c9e2121 _TFC7RxSwift4Sink9forwardOnuRq_S_12ObserverType_fGS0_q__FGOS_5Eventqq_S1_1E_T_ + 625
42 RxSwift 0x000000010c96c286 _TFC7RxSwift24DistinctUntilChangedSink2onu0_Rq_S_12ObserverType_fGS0_q_q0__FGOS_5Eventqq_S1_1E_T_ + 2326
43 RxSwift 0x000000010c96cdc3 _TTWu0_Rq_7RxSwift12ObserverType_GCS_24DistinctUntilChangedSinkq_q0__S0_S_FS0_2onuRq_S0__fq_FGOS_5Eventqq_S0_1E_T_ + 83
44 RxSwift 0x000000010c9e2121 _TFC7RxSwift4Sink9forwardOnuRq_S_12ObserverType_fGS0_q__FGOS_5Eventqq_S1_1E_T_ + 625
45 RxSwift 0x000000010c97ee49 _TFC7RxSwift7MapSink2onu0_Rq0_S_12ObserverType_fGS0_q_q0__FGOS_5Eventq__T_ + 985
46 RxSwift 0x000000010c97f423 _TTWu0_Rq0_7RxSwift12ObserverType_GCS_7MapSinkq_q0__S0_S_FS0_2onuRq_S0__fq_FGOS_5Eventqq_S0_1E_T_ + 83
47 RxSwift 0x000000010c8fbd31 _TPA + 113
48 RxSwift 0x000000010c8fb933 _TFV7RxSwift11AnyObserver2onurfGS0_q__FGOS_5Eventq__T_ + 387
49 RxSwift 0x000000010c8fba44 _TTWurGV7RxSwift11AnyObserverq__S_12ObserverTypeS_FS1_2onuRq_S1__fq_FGOS_5Eventqq_S1_1E_T_ + 68
50 RxSwift 0x000000010c903e35 _TFeRq_7RxSwift12ObserverType_S_VS_3Bag2onuRq_S0__fGS1_q__FGOS_5Eventqq_S0_1E_T_ + 1141
51 RxSwift 0x000000010c9a4df0 _TFC7RxSwift14PublishSubject16_synchronized_onurfGS0_q__FGOS_5Eventq__T_ + 1744
52 RxSwift 0x000000010c9a4689 _TFC7RxSwift14PublishSubject2onurfGS0_q__FGOS_5Eventq__T_ + 425
53 RxCocoa 0x000000010c7af712 _TFC7RxCocoa13DelegateProxy19interceptedSelectorfS0_FTV10ObjectiveC8Selector13withArgumentsGSQGSaPSs9AnyObject____T_ + 530
54 RxCocoa 0x000000010c7af7cd _TToFC7RxCocoa13DelegateProxy19interceptedSelectorfS0_FTV10ObjectiveC8Selector13withArgumentsGSQGSaPSs9AnyObject____T_ + 125
55 RxCocoa 0x000000010c78ede4 -[_RXDelegateProxy forwardInvocation:] + 180
56 CoreFoundation 0x000000010ccba727 ___forwarding___ + 487
57 CoreFoundation 0x000000010ccba4b8 _CF_forwarding_prep_0 + 120
58 UIFoundation 0x00000001144aa4ef -[NSTextStorage processEditing] + 283
59 UIFoundation 0x00000001144aa18b -[NSTextStorage endEditing] + 82
60 UIKit 0x000000010df740fd -[UITextInputController _insertText:fromKeyboard:] + 505
61 UIKit 0x000000010df74bcd -[UITextInputController insertText:] + 365
62 UIKit 0x000000010df2778b -[UITextView insertText:] + 62
63 UIKit 0x000000010d829a9b -[UIKeyboardImpl insertText:] + 149
64 UIKit 0x000000010d826278 -[UIKeyboardImpl performKeyboardOutput:] + 496
65 UIKit 0x000000010d825e65 __55-[UIKeyboardImpl handleKeyboardInput:executionContext:]_block_invoke_2 + 164
66 UIKit 0x000000010df94724 -[UIKeyboardTaskQueue continueExecutionOnMainThread] + 332
67 Foundation 0x000000010d149067 __NSThreadPerformPerform + 283
68 CoreFoundation 0x000000010cc90a31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
69 CoreFoundation 0x000000010cc8695c __CFRunLoopDoSources0 + 556
70 CoreFoundation 0x000000010cc85e13 __CFRunLoopRun + 867
71 CoreFoundation 0x000000010cc85828 CFRunLoopRunSpecific + 488
72 GraphicsServices 0x0000000113e90ad2 GSEventRunModal + 161
73 UIKit 0x000000010d581610 UIApplicationMain + 171
74 TestRX 0x000000010c6fd47d main + 109
75 libdyld.dylib 0x00000001105bd92d start + 1
76 ??? 0x0000000000000001 0x0 + 1
)
我能够在2.1.0和2.2.0上重现这一点
有人对如何解决这个问题有任何想法吗？
我目前的解决方法是执行单向绑定并将文本视图初始化为初始属性。
textview.text = testVar.value
textview.rx_text.subscribeNext({ self.testVar.value = $0 }) // and dispose it
这不允许我对任何模型更改做出反应，但就我而言，我很确定没有用户输入，模型不会更改。
从 Rx 2.2.0 支持，工作正常
https://github.com/ReactiveX/RxSwift/blob/master/RxExample/RxExample/Operators.swift