NSNumberFormatter 千分符

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  NSNumberFormatter *formatter=[[NSNumberFormatter alloc]init];    [formatter setGroupingSeparator:@","];    [formatter setGroupingSize:3];    [formatter setUsesGroupingSeparator:YES];    NSNumber *num= [NSNumber numberWithInt:144343];    NSString *str = [formatter stringFromNumber:num];  结果:144,343


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