Yellow Warnings: Conditional picking from UITextDocumentProxy to UIKeyInput always succeeds
I am working on keyboard, I just installed xcode 7 beta 2 and then I get a lot of warnings.
More than 24 yellow errors, I think this is causing the keyboard to crash on xcode 6.4 No errors and no keyboard Course
I find it difficult to resolve errors.
Warnings:
Conditional fetch from UITextDocumentProxy to UIKeyInput is always executed
func handleBtnPress(sender: UIButton) {
if let kbd = self.keyboard {
if let textDocumentProxy = kbd.textDocumentProxy as? UIKeyInput {
textDocumentProxy.insertText(sender.titleLabel!.text!)
}
kbd.hideLongPress()
if kbd.shiftState == ShiftState.Enabled {
kbd.shiftState = ShiftState.Disabled
}
kbd.setCapsIfNeeded()
}
}
Warnings:
Conditional selection from UITouch to UITouch is always done
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
for obj in touches {
if let touch = obj as? UITouch {
let view = self.touchToView[touch]
let touchPosition = touch.locationInView(self)
if self.bounds.contains(touchPosition) {
self.handleControl(view, controlEvent: .TouchUpInside)
}
else {
self.handleControl(view, controlEvent: .TouchCancel)
}
self.touchToView[touch] = nil
}
}
}
These are not errors, they are just warnings, and they are probably not the cause of your crashes, however you can solve these two examples by following these steps:
The protocol UITextDocumentProxy
is compliant anyway UIKeyInput
, so there is no need to use kbd.textDocumentProxy
both UIKeyInput
.
You can do the following without any warnings:
func handleBtnPress(sender: UIButton) {
if let kbd = self.keyboard {
kbd.textDocumentProxy.insertText(sender.titleLabel!.text!)
kbd.hideLongPress()
if kbd.shiftState == ShiftState.Enabled {
kbd.shiftState = ShiftState.Disabled
}
kbd.setCapsIfNeeded()
}
}
The same with obj
, the compiler already knows that it is an object UITouch
, so there is no need to throw it, you can output all the code from the statement if let touch = obj as? UITouch
like this:
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
for touch in touches {
let view = self.touchToView[touch]
let touchPosition = touch.locationInView(self)
if self.bounds.contains(touchPosition) {
self.handleControl(view, controlEvent: .TouchUpInside)
}
else {
self.handleControl(view, controlEvent: .TouchCancel)
}
self.touchToView[touch] = nil
}
}
Little tip: altclick on a variable to see what type was resolved like:
