尝试关闭选取器时收到错误

我创建了一个程序，其中点击我的文本字段时选择器显示，当我单击工具栏上的“完成”或“取消”按钮时，我试图解除它。尝试关闭选取器时收到错误

我不知道它出错的地方。虽然它说

“2017-09-28 20：45：27.877897-0600 project1 [51296：5112470] [LayoutConstraints]无法同时满足约束。”

我所有的约束都工作正常大气压..

这里是我的代码：

@IBOutlet weak var textField1: UITextField! 

override func viewDidLoad() { 
    super.viewDidLoad() 


    let picker: UIPickerView 

    picker = UIPickerView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 300)) 
    picker.backgroundColor = .white 

    picker.showsSelectionIndicator = true 
    picker.delegate = self 
    picker.dataSource = self 

    let toolBar = UIToolbar(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 40)) 
    toolBar.barStyle = UIBarStyle.default 
    toolBar.isTranslucent = true 
    toolBar.tintColor = .black 

    let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.plain, target: self, action: 
     Selector(("donePicker"))) 
    let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil) 
    let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.plain, target: self, action: Selector(("donePicker"))) 
    ) 

    toolBar.setItems([cancelButton, spaceButton, doneButton], animated: true) 
    toolBar.isUserInteractionEnabled = true 

    let bgView = UIView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 250 + toolBar.frame.size.height)) 
    print(picker.frame.size.height, toolBar.frame.size.height, bgView.frame.size.height) 


    bgView.addSubview(picker) 
    bgView.addSubview(toolBar) 
    textField1.inputView = bgView 
} 

func donePicker() { 
    textField1.resignFirstResponder() 
}

这是错误，它给我：

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger. 
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful. 
2017-09-28 20:45:29.253610-0600 project1[51296:5112470] [MC] Lazy loading NSBundle MobileCoreServices.framework 
2017-09-28 20:45:29.255001-0600 project1[51296:5112470] [MC] Loaded MobileCoreServices.framework 
2017-09-28 20:45:29.274235-0600 project1[51296:5112470] [MC] System group container for systemgroup.com.apple.configurationprofiles path is /Users/Andrew/Library/Developer/CoreSimulator/Devices/EE44EDE5-BDF6-4A15-A44B-387E14685DAA/data/Containers/Shared/SystemGroup/systemgroup.com.apple.configurationprofiles 
300.0 44.0 294.0 
2017-09-28 20:45:30.401748-0600 project1[51296:5112470] [MC] Reading from private effective user settings. 
2017-09-28 20:45:31.827410-0600 project1[51296:5112470] -[project1.CalculateViewController donePicker]: unrecognized selector sent to instance 0x7faac1d0fab0 
2017-09-28 20:45:31.835746-0600 project1[51296:5112470] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[project1.CalculateViewController donePicker]: unrecognized selector sent to instance 0x7faac1d0fab0' 
*** First throw call stack: 
(
    0 CoreFoundation      0x000000010c8a11cb __exceptionPreprocess + 171 
    1 libobjc.A.dylib      0x000000010a93cf41 objc_exception_throw + 48 
    2 CoreFoundation      0x000000010c921914 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132 
    3 UIKit        0x000000010d4660bd -[UIResponder doesNotRecognizeSelector:] + 295 
    4 CoreFoundation      0x000000010c824178 ___forwarding___ + 1432 
    5 CoreFoundation      0x000000010c823b58 _CF_forwarding_prep_0 + 120 
    6 UIKit        0x000000010d23f9bd -[UIApplication sendAction:to:from:forEvent:] + 83 
    7 UIKit        0x000000010dc3353f __45-[_UIButtonBarTargetAction _invoke:forEvent:]_block_invoke + 154 
    8 UIKit        0x000000010dc33470 -[_UIButtonBarTargetAction _invoke:forEvent:] + 181 
    9 UIKit        0x000000010d23f9bd -[UIApplication sendAction:to:from:forEvent:] + 83 
    10 UIKit        0x000000010d3b6183 -[UIControl sendAction:to:forEvent:] + 67 
    11 UIKit        0x000000010d3b64a0 -[UIControl _sendActionsForEvents:withEvent:] + 450 
    12 UIKit        0x000000010d3b53cd -[UIControl touchesEnded:withEvent:] + 618 
    13 UIKit        0x000000010d2b3d4f -[UIWindow _sendTouchesForEvent:] + 2807 
    14 UIKit        0x000000010d2b5472 -[UIWindow sendEvent:] + 4124 
    15 UIKit        0x000000010d25a802 -[UIApplication sendEvent:] + 352 
    16 UIKit        0x000000010db8ca50 __dispatchPreprocessedEventFromEventQueue + 2809 
    17 UIKit        0x000000010db8f5b7 __handleEventQueueInternal + 5957 
    18 CoreFoundation      0x000000010c8442b1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 
    19 CoreFoundation      0x000000010c8e3d31 __CFRunLoopDoSource0 + 81 
    20 CoreFoundation      0x000000010c828c19 __CFRunLoopDoSources0 + 185 
    21 CoreFoundation      0x000000010c8281ff __CFRunLoopRun + 1279 
    22 CoreFoundation      0x000000010c827a89 CFRunLoopRunSpecific + 409 
    23 GraphicsServices     0x00000001122ee9c6 GSEventRunModal + 62 
    24 UIKit        0x000000010d23dd30 UIApplicationMain + 159 
    25 UofA Engineering Master    0x0000000109ffa307 main + 55 
    26 libdyld.dylib      0x000000010fbc5d81 start + 1 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException 
(lldb)

来源

2017-09-29 A. Park

我曾尝试一个不同的方法来显示PickerView和toolbar在textField。

试试这个，如果它有助于您的方案：

let toolBar = UIToolbar() 
toolBar.barStyle = UIBarStyle.default 
toolBar.isTranslucent = true 
toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1) 
toolBar.sizeToFit() 

let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.plain, target: self, action: #selector(CalculateViewController.donePicker)) 
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil) 
let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.plain, target: self, action: #selector(CalculateViewController.cancelPicker)) 

toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false) 
toolBar.isUserInteractionEnabled = true 

textField1.inputView = pickerView 
textField1.inputAccessoryView = toolBar

来源

2017-09-29 04:09:40 Amit

你可以看到错误消息是：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[project1.CalculateViewController donePicker]: unrecognized selector sent to instance 0x7faac1d0fab0'

对于斯威夫特，我们不定义selector这样的（它的目的C方式）。你应该这样使用：

let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.plain, target: self, action: 
    #selector(donePicker))

来源

2017-09-29 04:12:49 t4nhpt

因为错误是无法识别的选择器发送给实例，所以你可以让选择器成为一个属性。将viewdidload方法中的let picker: UIPickerView替换为var picker: UIPickerView?

来源

2017-09-29 04:38:28

尝试关闭选取器时收到错误

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