cannot convert value of type 'String!' to ex

如果是按照上面那样写 ，会报如题错误。改为如下就可以了

var area_big:String! var area_small:String! var types = "" var firstIn = true provinces.forEach { (province) in let count = province.children.count for i in 0..<count{ if i == 0 && province.children[i].checked { if area_big == nil { area_big = province.children[i].attributes["name"] }else{ area_big = area_big + "#" + province.children[i].attributes["name"]! } } } }

（编辑：李大同）

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