Question

我的JSON＆＃34; R1＆＃34;返回1或0.使用1我想让我的标签变蓝。我的代码中我做错了什么？

myJson = {
    "product": "IPX800_V4",
    "R1": 0,
    "R2": 0,
    "R3": 0,
    "R4": 0,
    "R5": 0,
    "R6": 0,
    "R7": 0,
    "R8": 0,
    "R9": 0,
    "R10": 0,
    "R11": 0,
    "R12": 0,
    "R13": 0,
    "R14": 0,
    "R15": 0,
 }

来自监视器的解析工作0和1。

我的标签名为led1，当＆＃34; r1＆＃34; = 1

class ViewController: UIViewController {
    @IBOutlet weak var led1: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = URL(string: "http://192.168.1.201/api/xdevices.json?key=apikey&Get=R")
        let task = URLSession.shared.dataTask(with: url!) { (data, respense, error) in
            if error != nil
            { print("error") }
            else
            {
                if let content = data
                {
                    do
                    {
                        let myJson = try JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers) as AnyObject

                        let r1 = myJson["R1"]
                        if let r1 = myJson["R1"] { print(r1!) }
                        if ( r1 > 0) { self.led1.backgroundColor = UIColor.blue }
                    }
                    catch {    
                    }
                }
            }
        }
        task.resume()
    }
}

Answer 1

您需要更新主线程上的UI。在Swift 3中：

if ( r1 > 0) {
    DispatchQueue.main.async {
        self.led1.backgroundColor = UIColor.blue
    }
}

根据JSON中的值更改标签的颜色

1 个答案: