那种类似toolbar可以提拖动的

原创 于 2010-09-26 16:40:17 发布 · 167 阅读 · 0 ·
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本文介绍了一种使用 UIButton 和 UIScrollView 实现自定义滚动工具栏的方法。该工具栏支持按钮高亮显示及平滑滚动效果，并通过定时器实现长按滑动功能。

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最开始, 是想利用toolBar来着,可惜好多原因(忘了?好像是图片要自动给你光化,如果利用custom button也有这些那些的问题, 还有就是间距什么的, 位置也不好算).

 

最终, 利用普通button + UIView + UIScrollView实现了个. 另外还悲剧的发现, 好像按钮没有长按时的那种事件..也是利用Ｔimer自己搞.

 

 

@interface ScrollToolBar2 : UIView<UIScrollViewDelegate> {
	UIScrollView *buttonView;
	UIButton *leftButton;
	UIButton *rightButton;
	UIButton *selectedButton;
	int isTouchHold;
	NSTimer *timer;
}

- (id)initWithFrame:(CGRect)frame defaultClickButtonPosition:(int)pos images:(UIImage *)firstImg, ...;
@end

 

#import "ScrollToolBar2.h"
#define BUTTON_LEFT_SPACE 10
#define BUTTON_RIGHT_SPACE 10
#define BUTTON_ITEM_SPACE 10
#define BUTTON_MOVE_SPACE 6

@implementation ScrollToolBar2
void switchBtnState(UIButton *button)
{

	UIImage *imgA = [button imageForState:UIControlStateNormal];
	UIImage *imgB = [button imageForState:UIControlStateHighlighted];
	[imgA retain];
	[imgB retain];
	[button setImage:imgB forState:UIControlStateNormal];
	[button setImage:imgA forState:UIControlStateHighlighted];
	[imgA release];
	[imgB release];
}


- (void) toggle:(UIButton *) button
{
	if (selectedButton == button) {
		return;
	}

	if (selectedButton)
	{
		switchBtnState(selectedButton);
	}

	
	selectedButton = button;
	switchBtnState(button);
	float width = buttonView.frame.size.width;
	CGRect rect = button.frame;
	float offsetCenter = buttonView.contentOffset.x + width / 2;

	if((rect.origin.x + rect.size.width / 2) < offsetCenter) { // button in left
		float offset = rect.origin.x - (offsetCenter - rect.size.width / 2);
		CGPoint contentOffset = buttonView.contentOffset;
		contentOffset.x = contentOffset.x + offset;
		contentOffset.x = contentOffset.x < 0 ? 0 : contentOffset.x;
		[buttonView setContentOffset:contentOffset animated:YES];
	}
	else { //button in right
		float offset = rect.origin.x - (offsetCenter - rect.size.width / 2);
		CGPoint contentOffset = buttonView.contentOffset;
		contentOffset.x = contentOffset.x + offset;
		contentOffset.x = contentOffset.x > (buttonView.contentSize.width - width) ? (buttonView.contentSize.width - width) : contentOffset.x;
		[buttonView setContentOffset:contentOffset animated:YES];
	}
}



- (id)initWithFrame:(CGRect)frame defaultClickButtonPosition:(int)pos images:(UIImage *)firstImg, ...
{
	if ((self = [super initWithFrame:frame]))
	{
		UIButton *defaultClickBtn = nil;
		isTouchHold = 0;
		int i = 0;
		float totalWidth = BUTTON_LEFT_SPACE;
		va_list params;
		va_start(params, firstImg);
		UIImage *now = va_arg(params,UIImage *);
		UIImage *prev = firstImg;
		NSMutableArray *buttons = [[NSMutableArray alloc] init];
		while(firstImg)
		{
			UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
			[button setImage:prev forState:UIControlStateNormal];
			[button setImage:now forState:UIControlStateHighlighted];
			[button addTarget:self action:@selector(toggle:) forControlEvents:UIControlEventTouchDown];
			button.frame = CGRectMake(totalWidth, 0, prev.size.width, prev.size.height);

			button.tag = i;
			if (i == pos) {
				defaultClickBtn = button;
				[defaultClickBtn retain];
			}

			totalWidth += prev.size.width + BUTTON_ITEM_SPACE;
			[buttons addObject:button];

			i++;
			prev = va_arg(params,UIImage *);
			if(prev == nil)
			{
				break;
			}

			now = va_arg(params,UIImage *);
		}
		
		totalWidth = totalWidth - BUTTON_ITEM_SPACE + BUTTON_RIGHT_SPACE;
		buttonView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0, 0.0, frame.size.width, frame.size.height)];
		buttonView.pagingEnabled = NO;
		buttonView.contentSize = CGSizeMake(totalWidth, frame.size.height);
		buttonView.showsHorizontalScrollIndicator = NO;
		buttonView.showsVerticalScrollIndicator = NO;
		buttonView.scrollsToTop = NO;
		
		for(id btn in buttons)
		{
			[buttonView addSubview:btn];
		}
		
		
		UIImage *leftBtnImg = [UIImage imageNamed:@"submenu_left"];
		leftButton = [UIButton buttonWithType:UIButtonTypeCustom];
		leftButton.frame = CGRectMake(0.0, 0.0, leftBtnImg.size.width, leftBtnImg.size.height);
		[leftButton setImage:leftBtnImg forState:UIControlStateNormal];
		[leftButton retain];
		[leftButton addTarget:self action:@selector(offsetButtonTouchBegin:) forControlEvents:UIControlEventTouchDown];
		[leftButton addTarget:self action:@selector(offsetButtonTouchEnd:) forControlEvents:UIControlEventTouchUpInside];
		[leftButton addTarget:self action:@selector(offsetButtonTouchEnd:) forControlEvents:UIControlEventTouchUpOutside];
		
		UIImage *rightBtnImg = [UIImage imageNamed:@"submenu_right"];
		rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
		rightButton.frame = CGRectMake(frame.size.width - rightBtnImg.size.width, 0.0, rightBtnImg.size.width, rightBtnImg.size.height);
		[rightButton setImage:rightBtnImg forState:UIControlStateNormal];
		[rightButton retain];
		[rightButton addTarget:self action:@selector(offsetButtonTouchBegin:) forControlEvents:UIControlEventTouchDown];
		[rightButton addTarget:self action:@selector(offsetButtonTouchEnd:) forControlEvents:UIControlEventTouchUpInside];
		[rightButton addTarget:self action:@selector(offsetButtonTouchEnd:) forControlEvents:UIControlEventTouchUpOutside];
		

		UIImage *submenuBGImg = [UIImage imageNamed:@"submenu.png"];
		UIImageView *backgroundImg = [[UIImageView alloc] initWithImage:submenuBGImg];
		[self addSubview:backgroundImg];
		[self addSubview:buttonView];
		[self addSubview:leftButton];
		[self addSubview:rightButton];
		[self scrollViewDidEndDecelerating:buttonView ];
		[buttonView setDelegate:self];
		[backgroundImg release];
		[buttons release];
		
		if(defaultClickBtn) {
			[self toggle:defaultClickBtn];
			[defaultClickBtn release];
		}
	}
	
	return self;
}

- (void) transformation
{
	if (!timer) return;
	NSNumber *number = [timer userInfo];
	int offset = [number intValue];
	CGPoint offsetPoint = buttonView.contentOffset;
	offsetPoint.x = offsetPoint.x + offset;
	if (offsetPoint.x <= 0)
	{
		offsetPoint.x = 0;
		[timer invalidate];
		[timer release];
		timer = nil;
	}
	else if(offsetPoint.x >= (buttonView.contentSize.width - buttonView.frame.size.width))
	{
		offsetPoint.x = buttonView.contentSize.width - buttonView.frame.size.width;
		isTouchHold = 0;
		[timer invalidate];
		[timer release];
		timer = nil;
	}

	buttonView.contentOffset = offsetPoint;
}



- (void) startTimer:(id) sender
{
	int space = sender == leftButton ? BUTTON_MOVE_SPACE * -1 : BUTTON_MOVE_SPACE;
	NSNumber *number = [[NSNumber alloc] initWithInt:space];
	timer = [NSTimer scheduledTimerWithTimeInterval:0.005 target:self selector:@selector(transformation) userInfo:number repeats:YES];
	[timer retain];

	[number release];
}

- (void) offsetButtonTouchBegin:(id) sender
{
	isTouchHold = sender == leftButton ? -6 : 6;
	[self startTimer:sender];
}

- (void) offsetButtonTouchEnd:(id) sender
{
	[timer invalidate];
	[timer release];

	timer = nil;
	isTouchHold = 0;
}


void changeHiddenForButton(UIButton *button, BOOL isHidden)
{
	float alpha = isHidden ? 0.0 : 1.0;
	if (button.alpha == alpha) return;
	
	[UIView beginAnimations: nil context:nil];
	[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
	[UIView setAnimationDuration:1];
	button.alpha = alpha;

	[UIView commitAnimations];
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
	[self scrollViewDidEndDecelerating:scrollView];
}



- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
	float offset = scrollView.contentOffset.x;
	if (offset <= 0)
	{
		changeHiddenForButton(leftButton, YES);
	}
	else 
	{
		changeHiddenForButton(leftButton, NO);
	}
	
	if(offset >= (scrollView.contentSize.width - scrollView.frame.size.width))
	{
		changeHiddenForButton(rightButton, YES);
	}
	else
	{
		changeHiddenForButton(rightButton, NO);
	}
}

- (void)dealloc
{
	[buttonView release];
	[super dealloc];
}

@end
 

这下代码够完整了吧...给公司写的,但是未经过测试,保佑不被老大发现.哈哈, 其实没啥技术含量, 反正都是你抄我, 我抄你..就是计算那些坐标系很是麻烦的说..

效果图:


 

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