#import <UIKit/UIKit.h> @interface AppDelegate : UIResponder <UIApplicationDelegate> @property (strong, nonatomic) UIWindow *window; @end
#import "AppDelegate.h"
#import "RootViewController.h"
@interface AppDelegate () @end @implementation AppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.window.backgroundColor = [UIColor whiteColor]; self.window.rootViewController = [[RootViewController alloc] init]; [self.window makeKeyAndVisible];
return YES;
} @end
#import <UIKit/UIKit.h> @interface RootViewController : UIViewController @end
#import "RootViewController.h" @interface RootViewController ()<UITableViewDataSource,UITableViewDelegate>
{
UITableView *_tableView;
NSMutableArray *datas;
} @end @implementation RootViewController - (void)loadView{
[super loadView];
_tableView = [[UITableView alloc] initWithFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height - ) style:UITableViewStylePlain];
_tableView.dataSource = self;
_tableView.delegate = self;
[self.view addSubview:_tableView]; [self initializeButtonWithFrame:CGRectMake(, ,, ) title:@"滚到顶部" action:@selector(scrollToTop:)];
[self initializeButtonWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width - , , , ) title:@"滚到底部" action:@selector(scrollToButtom:)];
} - (void)viewDidLoad {
[super viewDidLoad];
self.title = @"测试"; datas = [[NSMutableArray alloc] init];
for (int i = ; i < ; i++) {
NSString *str = [NSString stringWithFormat:@"row:%d",i];
[datas addObject:str];
} }
/**
* 初始化按钮
*
* @param frame 尺寸
* @param title 标题
* @param aSEL 按钮的方法
*/
- (void)initializeButtonWithFrame:(CGRect)frame title:(NSString*)title action:(SEL)aSEL{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.backgroundColor = [UIColor grayColor];
btn.frame = frame;
[btn setTitle:title forState:];
[btn addTarget:self action:aSEL forControlEvents:UIControlEventTouchUpInside];
btn.backgroundColor = [UIColor grayColor];
[self.view addSubview:btn];
} - (void)scrollToTop:(UIButton*)sender{
NSLog(@"滚到顶部");
NSIndexPath *topRow = [NSIndexPath indexPathForRow: inSection:];
[_tableView scrollToRowAtIndexPath:topRow atScrollPosition:UITableViewScrollPositionTop animated:YES];
} - (void)scrollToButtom:(UIButton*)sender{
NSLog(@"滚到底部");
NSIndexPath *buttomRow = [NSIndexPath indexPathForRow:datas.count - inSection:];
[_tableView scrollToRowAtIndexPath:buttomRow atScrollPosition:UITableViewScrollPositionBottom animated:YES];
} #pragma mark -- tableView的代理 --
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return ;
} - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return datas.count;
} - (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
}
cell.textLabel.text = datas[indexPath.row];
return cell;
} @end