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#import "RootViewController.h" #define width [UIScreen mainScreen].bounds.size.width #define height [UIScreen mainScreen].bounds.size.height #define topH 64 @interface RootViewController ()<UITableViewDataSource,UITableViewDelegate> @property (nonatomic, strong) UITableView *tableView; @property (nonatomic, strong) NSMutableArray *rowData; @end @implementation RootViewController - (void)loadView { [super loadView]; // 初始化view UIView *aView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, topH)]; aView.backgroundColor = [UIColor grayColor]; [self.view addSubview:aView]; // 初始化leftButton SEL leftSel = NSSelectorFromString(@"scrollToTop:"); UIButton *leftBtn = [self setupButtonWithTitle:@"top" withFrame:CGRectMake(0, 20, 80, topH - 20) withSelector:leftSel]; [self.view addSubview:leftBtn]; // 初始化rigthButton SEL rightSel = NSSelectorFromString(@"scrollToBottom:"); UIButton *rightBtn = [self setupButtonWithTitle:@"bottom" withFrame:CGRectMake(width - 80 - 20, 20, 80, topH-20) withSelector:rightSel]; [self.view addSubview:rightBtn]; // 初始化_tableView self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, topH,width, height - topH) style:UITableViewStylePlain]; self.tableView.dataSource = self; self.tableView.delegate = self; [self.view addSubview:self.tableView]; } /** * 初始化Button * * @param aTitle Button的标题 * @param aFrame Button的框架 * @param aSelector Button的方法 * * @return Button */ - (UIButton *)setupButtonWithTitle:(NSString *)aTitle withFrame:(CGRect)aFrame withSelector:(SEL)aSelector { UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; btn.frame = aFrame; [btn setTitle:aTitle forState:0]; btn.titleLabel.font = [UIFont systemFontOfSize:25]; [btn addTarget:self action:aSelector forControlEvents:UIControlEventTouchUpInside]; return btn; } - (void)viewDidLoad { [super viewDidLoad]; [self loadData]; } /** * 加载数据 */ -(void)loadData { if (self.rowData!=nil) { [self.rowData removeAllObjects]; self.rowData=nil; } self.rowData = [[NSMutableArray alloc] init]; for (int i=0 ; i<100;i++) { [self.rowData addObject:[NSString stringWithFormat:@"Row: %i",i]]; } [self.tableView reloadData]; } - (void)scrollToTop:(UIButton *)sender { NSIndexPath *topRow = [NSIndexPath indexPathForRow:0 inSection:0]; [self.tableView scrollToRowAtIndexPath:topRow atScrollPosition:UITableViewScrollPositionTop animated:YES]; } - (void)scrollToBottom:(UIButton *)sender { NSIndexPath *bottomRow = [NSIndexPath indexPathForRow:[self.rowData count]-1 inSection:0]; [self.tableView scrollToRowAtIndexPath:bottomRow atScrollPosition:UITableViewScrollPositionBottom animated:YES]; } #pragma mark -UITableView delegates- - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [self.rowData count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } cell.selectionStyle = UITableViewCellSelectionStyleNone; cell.textLabel.text = [self.rowData objectAtIndex:indexPath.row]; return cell; } @end
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原文地址:http://www.cnblogs.com/lantu1989/p/4736062.html