iOS swift-开发笔记

//*****//获取对象类型

object_getClass(对象)

//*****//数字类型字符串转Int

let powerint : Int = Int(data["battery2"] as! String)!

//*****//判断大小dataInfo["amount"] as! String ="2.00"

let amount = dataInfo["amount"] as! String

let duo = 0.00

if Double(amount)! > duo{

}

//*****//判断字典为空

dic.allKeys.count==0

//*****//判断字典某一key是否存在

dic.object(forKey: "id") != nil

//*****//判断字典某一key的值是否为NSNull

dic["wall"] is NSNull

//*****//判断字符串1中含有另一字符串2

if (字符串1.range(of: "字符串2") != nil) {

}

//*****//判断替换字符串中某一字符

let version1 = iosgengXin["version"] as! String

let version2 = version1.replacingOccurrences(of: ".", with: "")

//*****//获取绝对值

abs(-1) == 1