字典排序
NSDictionary* dict = @{@"class":@"1",@"group":@"a",@"day":@"day2",@"month":@"12",@"year":@"2016"};
NSArray* keys = [dict allKeys];
NSArray* array = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
return [obj1 compare:obj2 options:NSNumericSearch];
}];
NSLog(@"%@",array);
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