我有一个UIScrollView
,它有几个视图。当用户轻拂手指时,视图会根据手指轻弹的方向向右或向左滚动。基本上我的代码的工作方式与iPhone照片应用程序类似。现在,有没有一种方法可以通过编程方式执行相同的操作,以便最终得到一个幻灯片,只需单击一个按钮就可以自行运行,并在每个滚动之间进行可配置的暂停?
你如何使用UIScrollView
进行幻灯片演示?
答案 0 :(得分:360)
您可以使用Objective-C
中的以下某个语句滚动到滚动视图中的某个点[scrollView setContentOffset:CGPointMake(x, y) animated:YES];
或Swift
scrollView.setContentOffset(CGPoint(x: x, y: y), animated: true)
请参阅guide "Scrolling the Scroll View Content" from Apple as well。
要使用UIScrollView
进行幻灯片放映,您可以在滚动视图中排列所有图像,设置重复计时器,然后在计时器触发时-setContentOffset:animated:
。
但更有效的方法是使用2个图像视图并使用转换交换它们,或者只是在计时器触发时切换位置。有关详细信息,请参阅iPhone Image slideshow。
答案 1 :(得分:37)
如果要控制动画的持续时间和样式,可以执行以下操作:
[UIView animateWithDuration:2.0f delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
scrollView.contentOffset = CGPointMake(x, y);
} completion:NULL];
调整持续时间(2.0f
)和选项(UIViewAnimationOptionCurveLinear
)以品尝!
答案 2 :(得分:10)
另一种方式是
scrollView.contentOffset = CGPointMake(x,y);
答案 3 :(得分:7)
使用Swift中的动画
scrollView.setContentOffset(CGPointMake(x, y), animated: true)
答案 4 :(得分:3)
Swift 3
let point = CGPoint(x: 0, y: 200) // 200 or any value you like.
scrollView.contentOffset = point
答案 5 :(得分:2)
scrollView.setContentOffset(CGPoint(x: y, y: x), animated: true)
答案 6 :(得分:2)
[Scrollview setContentOffset:CGPointMake(x, y) animated:YES];
答案 7 :(得分:1)
- (void)viewDidLoad
{
[super viewDidLoad];
board=[[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.height, 80)];
board.backgroundColor=[UIColor greenColor];
[self.view addSubview:board];
// Do any additional setup after loading the view.
}
-(void)viewDidLayoutSubviews
{
NSString *str=@"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
index=1;
for (int i=0; i<20; i++)
{
UILabel *lbl=[[UILabel alloc]initWithFrame:CGRectMake(-50, 15, 50, 50)];
lbl.tag=i+1;
lbl.text=[NSString stringWithFormat:@"%c",[str characterAtIndex:arc4random()%str.length]];
lbl.textColor=[UIColor darkGrayColor];
lbl.textAlignment=NSTextAlignmentCenter;
lbl.font=[UIFont systemFontOfSize:40];
lbl.layer.borderWidth=1;
lbl.layer.borderColor=[UIColor blackColor].CGColor;
[board addSubview:lbl];
}
[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(CallAnimation) userInfo:nil repeats:YES];
NSLog(@"%d",[board subviews].count);
}
-(void)CallAnimation
{
if (index>20) {
index=1;
}
UIView *aView=[board viewWithTag:index];
[self doAnimation:aView];
index++;
NSLog(@"%d",index);
}
-(void)doAnimation:(UIView*)aView
{
[UIView animateWithDuration:10 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
aView.frame=CGRectMake(self.view.frame.size.height, 15, 50, 50);
}
completion:^(BOOL isDone)
{
if (isDone) {
//do Somthing
aView.frame=CGRectMake(-50, 15, 50, 50);
}
}];
}
答案 8 :(得分:0)
我正在演示如何使用两个UIView创建一个简单的滚动视图,并添加一些自动布局约束,以便其平滑滚动。
我想您在main.storyboard中有一个空的视图控制器。
1。添加 UIView 。
ld = [[{'Instant_ID': 409597}, {'Token': 'You'}], [{'Instant_ID': 409597}, {'Token': 'matter'}], [{'Instant_ID': 409597}, {'Token': 'manager'}], [{'Instant_ID': 809558}, {'Token': 'metro'}], [{'Instant_ID': 809558}, {'Token': 'station'}], [{'Instant_ID': 829258}, {'Token': 'bucket'}], [{'Instant_ID': 829258}, {'Token': 'water'}]]
>>> [[e[1]['Token'] for e in v] for k,v in groupby(ld, lambda x: x[0]['Instant_ID'])]
[['You', 'matter', 'manager'], ['metro', 'station'], ['bucket', 'water']]
2。添加 ScrollView 。
let view = UIView()
view.backgroundColor = UIColor.green
self.view.addSubview(view)
view.translatesAutoresizingMaskIntoConstraints = false
top = view.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 0)
left = view.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 0)
right = view.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: 0)
bottom = view.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: 0)
height = view.heightAnchor.constraint(equalToConstant: self.view.frame.height)
NSLayoutConstraint.activate([top, right, left, height, bottom])
3。添加第一个 UILabel 。
let scroll = UIScrollView()
scroll.backgroundColor = UIColor.red
view.addSubview(scroll)
scroll.translatesAutoresizingMaskIntoConstraints = false
top = scroll.topAnchor.constraint(equalTo: view.topAnchor, constant: 10)
left = scroll.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0)
right = scroll.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0)
bottom = scroll.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -10)
NSLayoutConstraint.activate([top, right, left, bottom])
4。添加第二个 UILabel 。
let l2 = UILabel()
l2.text = "Label1"
l2.textColor = UIColor.black
l2.backgroundColor = UIColor.blue
scroll.addSubview(l2)
l2.translatesAutoresizingMaskIntoConstraints = false
top = l2.topAnchor.constraint(equalTo: scroll.topAnchor, constant: 10)
left = l2.leadingAnchor.constraint(equalTo: scroll.leadingAnchor, constant: 10)
height = l2.heightAnchor.constraint(equalToConstant: 100)
right = l2.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -10)
NSLayoutConstraint.activate([top, left, right, height])
答案 9 :(得分:0)
这是另一个对我来说效果很好的用例。
代码:Swift 5.3
// Assuming you have a view named "targeView"
scrollView.scroll(to: CGPoint(x:targeView.frame.minX, y:targeView.frame.minY), animated: true)
如您所想,如果您想滚动以显示目标视图的底部,请使用 maxX 和 minY。