如何从我的滚动视图中删除所有子视图...
how do i remove all subviews from my scrollview...
我在滚动视图中有一个 uiview 和它上方的按钮,如下所示....
i have a uiview and a button above it in the scrollview something like this....
这是我在滚动视图中添加子视图的代码
here is my code to add subview in scroll view
-(void)AddOneButton:(NSInteger)myButtonTag {
lastButtonNumber = lastButtonNumber + 1;
if ((lastButtonNumber == 1) || ((lastButtonNumber%2) == 1)) {
btnLeft = 8;}
else if ((lastButtonNumber == 2) || ((lastButtonNumber%2) == 0)) {
btnLeft = 162;
}
CGRect frame1 = CGRectMake(btnLeft, btnTop, 150, 150);
CGRect frame2 = CGRectMake(btnLeft, btnTop, 150, 150);
UIButton *Button = [UIButton buttonWithType:UIButtonTypeCustom];
Button.frame = frame1;
Button.tag = myButtonTag;
[Button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
[Button setBackgroundColor:[UIColor clearColor]];
[Button setBackgroundImage:[UIImage imageNamed:@"WaitScreen.png"] forState:UIControlStateHighlighted];
GraphThumbViewControllerobj = [[GraphThumbViewController alloc] initWithPageNumber:[[GraphIdArray objectAtIndex:myButtonTag]intValue]];
GraphThumbViewControllerobj.view.frame=frame2;
GraphThumbViewControllerobj.lblCounter.text=[NSString stringWithFormat:@"%d of %d",myButtonTag+1,flashCardsId.count];
GraphThumbViewControllerobj.lblQuestion.text=[flashCardText objectAtIndex:myButtonTag];
[myScrollView addSubview:GraphThumbViewControllerobj.view];
[myScrollView addSubview:Button];
if ((lastButtonNumber == 2) || ((lastButtonNumber%2) == 0)) {
btnTop = btnTop + 162;
}
if (btnTop+150 > myScrollView.frame.size.height) {
myScrollView.contentSize = CGSizeMake((myScrollView.frame.size.width), (btnTop+160));}
}
这是删除子视图的代码
if(myScrollView!=nil)
{
while ([myScrollView.subviews count] > 0) {
//NSLog(@"subviews Count=%d",[[myScrollView subviews]count]);
[[[myScrollView subviews] objectAtIndex:0] removeFromSuperview];
}
要从任何视图中删除所有子视图,您可以遍历子视图并为每个子视图发送 removeFromSuperview
调用:
To remove all the subviews from any view, you can iterate over the subviews and send each a removeFromSuperview
call:
// With some valid UIView *view:
for(UIView *subview in [view subviews]) {
[subview removeFromSuperview];
}
不过,这完全是无条件的,并且会删除给定视图中的所有子视图.如果你想要更细粒度的东西,你可以采取几种不同的方法:
This is entirely unconditional, though, and will get rid of all subviews in the given view. If you want something more fine-grained, you could take any of several different approaches:
removeFromSuperview
消息removeFromSuperview
if
语句,检查类是否相等.例如,要仅删除视图中存在的所有 UIButton(或 UIButton 的自定义子类),您可以使用以下内容:removeFromSuperview
messages later in the same mannerremoveFromSuperview
individually as necessaryif
statement to the above loop, checking for class equality. For example, to only remove all the UIButtons (or custom subclasses of UIButton) that exist in a view, you could use something like:// Again, valid UIView *view:
for(UIView *subview in [view subviews]) {
if([subview isKindOfClass:[UIButton class]]) {
[subview removeFromSuperview];
} else {
// Do nothing - not a UIButton or subclass instance
}
}
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