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: