incompatible pointer types assigning to 'nsmutablearray ' from 'nsarray '
這是因為NSMutableArray和NSArray不是同一個型別造成的.
解決方法
// NSArray --> NSMutableArray
NSMutableArray *myMutableArray = [myArray mutableCopy];
// NSMutableArray --> NSArrayNSArray *myArray = [myMutableArray copy];
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