请考虑以下代码:
override var keyCommands: [UIKeyCommand]? {
var commands:[UIKeyCommand] = []
let numbers = ["0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"]
for number in numbers {
let txt = number as String
commands.append(UIKeyCommand(input: txt, modifierFlags: [], action: #selector(keyPressed(_:))))
}
commands.append(UIKeyCommand(input: "\r", modifierFlags: [], action: #selector(enterPressed)))
return commands
}
出于某种原因,只有数字被读取。这适用于模拟键盘的蓝牙条形码扫描仪。keyCommands 不能读取字母字符还是我做错了什么?