ios - 如果外围设备出现问题则循环

Question

我正在处理外设扫描仪，但我遇到了 if 循环问题。我收到错误:“for 语句中的预期条件”和“语句的支撑 block 是未使用的闭包”。这是这个循环:

func peripheral(peripheral: CBPeripheral!, didDiscoverServices error: NSError!)
{
    if let servicePeripheral = peripheral.services as? [CBService]
    {
       for peripheral.services in CBService
        {
        println("\(servicePeripheral)")
        }
    }
}

Answer 1

您的 for 循环格式不正确。你有:

for <some existing value> in <a data type> {
}

相反你想要:

for <new variable> in <some collection> {
}

也许您打算遍历 [CBService](CBService 的数组):

func peripheral(peripheral: CBPeripheral!, didDiscoverServices error: NSError!)
{
    if let servicePeripherals = peripheral.services as? [CBService]
    {
        for servicePeripheral in servicePeripherals
        {
            println("\(servicePeripheral)")
        }
    }
}