swift基础--获取描述文件大小
2019-05-15 本文已影响0人
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func getSizeDescription(size:String)->String{
if(size.isEmpty){
return "0B"
}
let s = Double(size)!
let t = s / pow(1024,4)
if(t > 1){
return String(format: "%0.1f",t)+ "T"
}
let g = s / pow(1024,3)
if(g > 1){
return String(format: "%0.1f",g)+ "G"
}
let m = s / pow(1024,2)
if(m > 1){
return String(format: "%0.1f",m)+ "M"
}
let k = s / pow(1024,1)
if(k > 1){
return String(format: "%.1f",k)+ "k"
}
return size + "B"
}
