摘要： sh数组快速倒序 NSArray *arr = @[@"first",@"second"]; arr = arr.reverseObjectEnumerator.allObjects; NSLog(@"%@",arr);数组快速去重 NSArray*arr=@[@"first",@"second",@"first"]; arr=[arrvalueForKeyPath:@"@distinctUnionOfObjects.self"]; NSLog(@&quo 阅读全文