Programming/Udacity Nano Degree - iOS Developer (7) 썸네일형 리스트형 Unexpectedly found nil while implicitly unwrapping an optional value stackoverflow.com/questions/32170456/what-does-fatal-error-unexpectedly-found-nil-while-unwrapping-an-optional-valu What does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean? My Swift program is crashing with EXC_BAD_INSTRUCTION and one of the following similar errors. What does this error mean, and how do I fix it? Fatal error: Unexpectedly found nil while unwrappi.. Class: UISwitch A control that offers a binary choice, such as on/off. Declaration class UISwitch : UIControl Overview The UISwitch class declares a property and a method to control its on/off state. As with UISlider, when the user manipulates the switch control (“flips” it), it triggers the valueChanged event. You can customize the appearance of the switch by changing the color used to tint the switch when it .. View Controller An object that manages a view hierarchy for your UIKit app. Declaration class UIViewController : UIResponder Overview The UIViewController class defines the shared behavior that is common to all view controllers. You rarely create instances of the UIViewController class directly. Instead, you subclass UIViewController and add the methods and properties needed to manage the view controller's view.. Connecting the Stop Recording Button From Code to UI Element Record 버튼 누른뒤에 원래 있던 문구가 Recording in Progress로 바뀐걸 볼 수 있음. Pitch Perfect - Adding Code for the Button Button 누를때마다 밑에 Console에 record button was pressed 나타나는 걸 볼 수 있음. Fixed Constraints 이전 1 다음
