我想要的是一个 UIView
,里面有很多 UIButtons
。它们根据存储在 NSArray
中的数据进行放置和排列。因为有很多按钮,它们不能一次全部放在屏幕上。用户应该能够缩小以查看所有按钮或放大以查看详细信息(按钮上的标签)并轻松选择它们。
我尝试了两种不同的方法:
1) 我构建了一个 UIView
子类,将按钮放入其中,并将此 View 的实例放入 UIScrollview
。
效果:我可以通过它们的标签访问所有按钮,并且滚动和缩放工作正常。但我无法获得处理任何事件的按钮(按下它们)...
2) 我写了一个功能完全相同的 UIViewController
并将它的一个实例添加到 UIScrollView
。
效果:我现在可以按下按钮了,但是滚动和缩放已经停止工作了。
这里是 View 的相关代码:
- (UIView *)initWithArrayNSArray *)nArray{
self = [super init];
if (self) {
int count = [nArray count];
for (int i=0; i<count; i++) {
UIButton *button = [[UIButton alloc]
initWithFrame__some Code to place the Button__);
button.tag = i+1;
NSString *title = [[NSString alloc] initWithFormat:__code for generating Title__];
[button setTitle:title forState:UIControlStateNormal];
button.titleLabel.font = [UIFont systemFontOfSize:14];
[button addTarget:self actionselector(buttonPressed forControlEvents:UIControlEventTouchDown];
[self addSubview:button];
}
}
return self;
}
以及 matrixController 的代码:
- (void)viewDidLoad
{
[super viewDidLoad];
NSMutableArray *nArray = [[NSMutableArray alloc] __some code___];
int count = [nArray count];
for (int i=0; i<count; i++) {
UIButton *button = [[UIButton alloc]
initWithFrame:CGRectMake(__some Code to place the Button__];
button.tag = i+1;
NSString *title = [[NSString alloc] initWithFormat:__code for generating Title__];
[button setTitle:title forState:UIControlStateNormal];
button.titleLabel.font = [UIFont systemFontOfSize:14];
[button addTarget:self actionselector(buttonPressed forControlEvents:UIControlEventTouchDown];
[self.view addSubview:button];
}
}
ScrollViewController
的代码:
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 768, 970)];
[self.view addSubview:scrollView];
[scrollView setBackgroundColor:[UIColor blackColor]];
//Zooming
[scrollView setMinimumZoomScale:0.25];
[scrollView setMaximumZoomScale:4.0];
[scrollView setDelegate:self];
// constructing the view
[scrollView addSubview:chartView];
[scrollView bringSubviewToFront:chartView];
或
[scrollView addSubview:[matrixController view]];
我怎样才能让它工作??
我能够获得一个包含多个按钮的 ScrollView ,可以很好地平移和缩放,而这些按钮仍在处理触摸事件:
- (void)didTapButtonUIButton *)button
{
NSLog(@"Button %ld", (long)button.tag);
}
- (void)viewDidLoad
{
[super viewDidLoad];
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
scrollView.delegate = self;
scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * 3.0f, scrollView.frame.size.height * 3.0f);
scrollView.maximumZoomScale = 3.0f;
UIView *zoomView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, scrollView.contentSize.width, scrollView.contentSize.height)];
zoomView.backgroundColor = [UIColor whiteColor];
for (NSInteger index = 0; index < 100; index++)
{
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake((scrollView.frame.size.width / 2.0f) - 50.0f, 10.0f + (50.0f * (CGFloat)index), 100.0f, 30.0f);
button.tag = index;
[button setTitle:[NSString stringWithFormat"Button %ld", ((long)index + 1)] forState:UIControlStateNormal];
[button addTarget:self actionselector(didTapButton forControlEvents:UIControlEventTouchUpInside];
[zoomView addSubview:button];
}
[scrollView addSubview:zoomView];
[self.view addSubview:scrollView];
}
- (UIView *)viewForZoomingInScrollViewUIScrollView *)scrollView
{
return [scrollView.subviews objectAtIndex:0];
}
编辑:我在下面的评论中说过不要依赖标签,但我在这里做。 这只是为了让我可以记录按钮编号,因此应该忽略该部分。
关于ios - 带有大量 UIButtons 的 UIScrollView,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7497590/
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