移除指定范围的数组
NSMutableArray * array = [NSMutableArray new];
for (int i = 0; i < 15; i++) {
[array addObject:@(i)];
}
NSLog(@"%@",array);
NSRange range = {10,array.count - 10};
[array removeObjectsInRange:range]; NSLog(@"%@",array);
比较两个数组是否相等
NSSet *seta = [NSSet setWithArray:self.selectedArray];
NSSet *setb = [NSSet setWithArray:self.labelArray];
}