UITableView滚动以一定的速度平滑?

内容来源于 Stack Overflow,并遵循CC BY-SA 3.0许可协议进行翻译与使用

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用的方法是:

- scrollToRowAtIndexPath:atScrollPosition:animated:
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用户回答回答于

.h文件:

#import <UIKit/UIKit.h>

@interface AutomaticTableViewScrollViewController : UIViewController <UITableViewDelegate,UITableViewDataSource>
{
    UITableView *slotMachine;
    NSMutableArray *listOfItems;
    NSTimer *tableTimer;
}

@property (nonatomic,retain) UITableView *slotmachine;
@property (nonatomic,retain) NSMutableArray *listOfItems;
@property (nonatomic,retain) NSTimer *tableTimer;

-(void)automaticScroll;
-(void)stopscroll;

@end

.m文件:

#import "AutomaticTableViewScrollViewController.h"

@implementation AutomaticTableViewScrollViewController

@synthesize slotmachine;
@synthesize listOfItems;
@synthesize tableTimer;

-(void)loadView
{
    [super loadView];

    slotmachine = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStylePlain];
    slotmachine.delegate = self;
    slotmachine.dataSource = self;
    [self.view addSubview:slotmachine];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{    
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Set up the cell...
    if (indexPath.row % 2 == 0) 
    {
        cell.textLabel.text = @"blalala";
    }

    return cell;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 99999;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //you might want to do this action in ur buttonTargetMethod
    //start timers
    tableTimer = [NSTimer scheduledTimerWithTimeInterval:0.2 //this value arranges the speed of the autoScroll
                                                   target:self
                                                 selector:@selector(automaticScroll)
                                                 userInfo:nil
                                                  repeats:YES];

    [NSTimer scheduledTimerWithTimeInterval:5 //this arranges the duration of the scroll
                                     target:self
                                   selector:@selector(stopscroll)
                                   userInfo:nil
                                    repeats:NO]; 
}

-(void)automaticScroll
{
    [slotmachine setContentOffset:CGPointMake(slotmachine.contentOffset.x, slotmachine.contentOffset.y + 50) animated:YES]; //the 50 stands for the amount of movement every tick the timer will make
}

-(void)stopscroll
{
    //stop tabletimer again
    [tableTimer invalidate];
}

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return YES;
}

@end
用户回答回答于

可以使用:

 [UIView animateWithDuration: 1.0
                  animations: ^{
                      [tableViewExercises scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:previousSelectedExerciseCell inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];
                  }completion: ^(BOOL finished){
                  }
    ];

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