iOS 屏幕适配

    UIView*topView = [[UIViewalloc]init];

    [self.viewaddSubview:topView];

    topView.backgroundColor= [UIColorgreenColor];

    UIView*bottomView = [[UIViewalloc]init];

    [self.viewaddSubview:bottomView];

    bottomView.backgroundColor= [UIColorgreenColor];

    UITableView *tv = [[UITableView alloc]initWithFrame:CGRectZero];

    tv.delegate=self;

    tv.dataSource=self;

    [self.viewaddSubview:tv];

    tv.backgroundColor = [UIColor redColor];

    NSMutableArray * data = [NSMutableArray array];

    for(inti =0; i <50; i++) {

        [dataaddObject: [NSString stringWithFormat:@"%d",i]];

    }

    _data= data;

    [topViewmas_makeConstraints:^(MASConstraintMaker*make) {

        if(@available(iOS11.0, *)) {

            make.top.equalTo(self.view.mas_safeAreaLayoutGuideTop);

        }else{

            make.top.equalTo(self.mas_topLayoutGuide);

        }

        make.height.equalTo(@100);

        make.left.right.equalTo(self.view);

    }];

    [tvmas_makeConstraints:^(MASConstraintMaker*make) {

        make.top.equalTo(topView.mas_bottom);

        make.bottom.equalTo(bottomView.mas_top);

        make.left.right.equalTo(self.view);

    }];

    [bottomViewmas_makeConstraints:^(MASConstraintMaker*make) {

       make.left.right.equalTo(self.view);

        make.height.equalTo(@60);

        if(@available(iOS11.0, *)) {

            make.bottom.equalTo(self.view.mas_safeAreaLayoutGuideBottom);

        }else{

            // Fallback on earlier versions

            make.bottom.equalTo(self.bottomLayoutGuide);

        }

    }];