iphone - 保存并加载 UIScrollView 位置
<p><p>我正在创建一个应用程序，该应用程序使用滚动图像的 UIScrollView 和加载新 View 并允许新图像层(有点像 Photoshop 分层)的分段控件 - 出于某种原因，当我单击该层时，它记住该位置但创建一个新图层.... 我怎样才能阻止这种情况发生，所以一旦选择了图层并选择了图像，当用户返回时，它会转到最后加载的位置？</p>
<p>另外，作为附带的事情...当 UIScrollView 加载时，我不能使用我的手势识别或 UIAlertView？有谁知道为什么？</p>
<p>这是我的代码....提前致谢:)</p>
<pre><code>- layerControl:(NSInteger)index
{
UIScrollView *scroll = [ initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
scroll.pagingEnabled = YES;
NSInteger viewCount = 15;
for (int i = 0; i < viewCount; i++) {
CGFloat yOrigin = i * self.view.frame.size.width;
UIImageView *filterViewOverlay = [ initWithFrame:CGRectMake(yOrigin, 0, self.view.frame.size.width, self.view.frame.size.height)];
];
;
;
}
scroll.contentSize = CGSizeMake(self.view.frame.size.width * viewCount, self.view.frame.size.height);
;
;
switch (index)
{
case 0: scroll = self.scroll1;
case 1: scroll = self.scroll2;
case 2: scroll = self.scroll3;
case 4: scroll = self.scroll4;
case 5: scroll = self.scroll5;
}
/* if (scroll == nil)
{
[ initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
scroll.pagingEnabled = YES;
NSInteger viewCount = 15;
for (int i = 0; i < viewCount; i++) {
CGFloat yOrigin = i * self.view.frame.size.width;
UIImageView *filterViewOverlay = [ initWithFrame:CGRectMake(yOrigin, 0, self.view.frame.size.width, self.view.frame.size.height)];
];
;
//;
}
scroll.contentSize = CGSizeMake(self.view.frame.size.width * viewCount, self.view.frame.size.height);
;
; */
}
}
//Method to add a filter to the page
- (void)addFilter:(id)sender
{
UISegmentedControl *filterController = (UISegmentedControl *)sender;
];
}
- (UIImage*)saveImages
{
UIImage *image = ;
UIGraphicsBeginImageContext(self.view.bounds.size);
;
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>尝试在用户操作之前保存 <code>UIScrollView.contentOffset</code> 的值，然后在操作完成后恢复该值。</p></p>
<p style="font-size: 20px;">关于iphone - 保存并加载 UIScrollView 位置，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/8205740/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/8205740/
</a>
</p>
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