swift NSNumber 转 Sting 遇到的问题

发布时间：2020-12-14 02:09:25 所属栏目：百科来源：网络整理

导读：编译器报错：Could not cast value of type '__NSCFNumber' (0x...) to 'NSString' (0x...). 解决方案： The value is an NSNumber ,not an NSString . You can use stringValue to convert it: if let a = d [ "a" ] as ? NSNumber { aString a . stringVal

编译器报错：Could not cast value of type '__NSCFNumber' (0x...) to 'NSString' (0x...).

解决方案：

The value is anNSNumber,not anNSString. You can usestringValueto convert it:

if let a = d["a"]as? NSNumber { aString  a.stringValue println(aString) // -1}

If you're sure it's there,you can use forced unwrapping and string interpolation:

]!! "(a)"

（编辑：李大同）

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