扩展UITabBarController实现循环滑动效果
//在TabBar上加手势
-(void)setOpenGestury
{
//判断tabbar上的手势为空就创建
if ([self.view.gestureRecognizers count] == 0)
{
//加左右滑手势
UISwipeGestureRecognizer* recognizer = nil;
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(selectNextPage:)];
[recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)];
[self.view addGestureRecognizer:recognizer];
[recognizer release];
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(selectNextPage:)];
[recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
[self.view addGestureRecognizer:recognizer];
[recognizer release];
}
}
//手势触发
-(void)selectNextPage:(UISwipeGestureRecognizer*)recognizer
{
UIViewController* curViewC = self.selectedViewController;
if ([curViewC isKindOfClass:[UINavigationController class]])
{
int subCount = [((UINavigationController*)curViewC).viewControllers count];
if (subCount > 1)
{
//pop
if (recognizer.direction==UISwipeGestureRecognizerDirectionRight)
{
[((UINavigationController*)curViewC) popViewControllerAnimated:YES];
}
return;
}
}
NSArray* ary = self.viewControllers;
if (recognizer.direction==UISwipeGestureRecognizerDirectionLeft)
{
for (int iIndex = 1 ;iIndex < ary.count ;iIndex++)
{
int nextIndex = (self.selectedIndex + iIndex)%ary.count;
UIViewController* c = [ary objectAtIndex:nextIndex];
BOOL couldClick = YES;
if([self.delegaterespondsToSelector:@selector(tabBarController:shouldSelectViewController:)])
{
couldClick = [self.delegate tabBarController:self shouldSelectViewController:c];
}
if (!couldClick)
{
continue;
}
else
{
[self achieveAnimation:self.selectedIndex toIndex:nextIndexrecognizerDirection:UISwipeGestureRecognizerDirectionLeft];
self.selectedIndex = nextIndex;
break;
}
}
}
else if(recognizer.direction == UISwipeGestureRecognizerDirectionRight)
{
for (int searchCount = 1; searchCount < ary.count; searchCount++)
{
int nextIndex = (self.selectedIndex - searchCount + ary.count)%ary.count;
UIViewController* c = [ary objectAtIndex:nextIndex];
BOOL couldClick = YES;
if([self.delegaterespondsToSelector:@selector(tabBarController:shouldSelectViewController:)])
{
couldClick = [self.delegate tabBarController:self shouldSelectViewController:c];
}
if (!couldClick)
{
continue;
}
else
{
[self achieveAnimation:self.selectedIndex toIndex:nextIndexrecognizerDirection:UISwipeGestureRecognizerDirectionRight];
self.selectedIndex = nextIndex;
break;
}
}
}
}
//截图方法，图片用来做动画
-(UIImage*)imageByCropping:(UIView*)imageToCrop toRect:(CGRect)rect
{
CGFloat scale = [[UIScreen mainScreen] scale];
CGSize pageSize = CGSizeMake(scale*rect.size.width, scale*rect.size.height) ;
UIGraphicsBeginImageContext(pageSize);
CGContextScaleCTM(UIGraphicsGetCurrentContext(), scale, scale);
CGContextRef resizedContext =UIGraphicsGetCurrentContext();
CGContextTranslateCTM(resizedContext,-1*rect.origin.x,-1*rect.origin.y);
[imageToCrop.layer renderInContext:resizedContext];
UIImage*imageOriginBackground =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
imageOriginBackground = [UIImage imageWithCGImage:imageOriginBackground.CGImage scale:scaleorientation:UIImageOrientationUp];
return imageOriginBackground;
}
//实现动画效果
-(void)achieveAnimation:(int)originIndex toIndex:(int)toIndex recognizerDirection:(UISwipeGestureRecognizerDirection)direction
{
if (originIndex < 0 || originIndex >= self.viewControllers.count)
{
EZGAssert(0);
return;
}
if (toIndex < 0 || toIndex >= self.viewControllers.count)
{
EZGAssert(0);
return;
}
UIViewController* v1 = [self.viewControllers objectAtIndex:originIndex];
UIViewController* v2 = [self.viewControllers objectAtIndex:toIndex];
UIImage* image1 = [self imageByCropping:v1.view toRect:v1.view.bounds];
UIImage* image2 = [self imageByCropping:v2.view toRect:v1.view.bounds];
if (image1 == nil || image2 == nil)
{
EZGAssert(0);
return;
}
UIImageView* imageview1 = [[UIImageView alloc] initWithImage:image1];
UIImageView* imageview2 = [[UIImageView alloc] initWithImage:image2];
UIWindow* window = [UIApplication sharedApplication].keyWindow;
CGRect rectV1 = [v1.view convertRect:v1.view.bounds toView:window];
// CGRect rectV2 = [v2.view convertRect:v1.view.bounds toView:window];
//set possion
imageview1.frame = rectV1;
imageview2.frame = rectV1;
[window addSubview:imageview1];
[window addSubview:imageview2];
window.userInteractionEnabled = NO;
float screenWidth = [UIScreen mainScreen].bounds.size.width;
if (direction == UISwipeGestureRecognizerDirectionLeft)
{
//to left
imageview2.center = CGPointMake(imageview1.center.x + screenWidth, imageview1.center.y);
}
else
{
//to right
imageview2.center = CGPointMake(imageview1.center.x - screenWidth, imageview1.center.y);
}
[UIView animateWithDuration:0.3 animations:^{
if (direction == UISwipeGestureRecognizerDirectionLeft)
{
//to left
imageview1.center = CGPointMake(imageview1.center.x - screenWidth, imageview1.center.y);
imageview2.center = CGPointMake(imageview2.center.x - screenWidth, imageview1.center.y);
}
else
{
//to right
imageview1.center = CGPointMake(imageview1.center.x + screenWidth, imageview1.center.y);
imageview2.center = CGPointMake(imageview2.center.x + screenWidth, imageview1.center.y);
}
} completion:^(BOOL finished)
{
[imageview1 removeFromSuperview];
[imageview2 removeFromSuperview];
window.userInteractionEnabled = YES;
}];
}