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 usestringValue
to 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)"
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