非常感谢大家利用自己宝贵的时间来阅读我的文章 , 最近项目有个首页菜单定制的需求,类似于支付宝的首页模块定制， 如果有这种需求的小伙伴不妨看一下，希望能帮到你 , 当然, 有任何不妥的地方 欢迎指正。喜欢的可以关注下我的简书、我的博客
首先看一下效果展示吧（请忽略这个不忍直视的GIF😎）
需要的话可以去gitHub上下载--ZQVariableMenu
用法:把下载的demo里的ZQVariableMenu文件夹拷入项目文件中，在控制器中引用ZQVariableMenuControl.h，然后在点击响应方法里实现下面代码
NSArray *array1 = @[];//需要展示的title数组
NSArray *array2 = @[];//未展示的title数组
[[ZQVariableMenuControl shareControl] showChannelViewWithInUseTitles:array1 unUseTitles:array2 fixedNum:1 finish:^(NSArray *inUseTitles, NSArray *unUseTitles) {
NSLog(@"inUseTitles = %@",inUseTitles);
NSLog(@"unUseTitles = %@",unUseTitles);
}];
其中array1 为需要展示的title数组，array2为未展示的title数组，fixedNum需要固定的title数量，这里我只是实现让前面fixedNum个不能移动，可以根据自己的需要进行修改，具体代码位置在ZQVariableMenuView的数据源方法里,
实现思路：
1、为collectionView添加长按手势
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressMethod:)];
longPress.minimumPressDuration = 0.3f;
[_collectionView addGestureRecognizer:longPress];
2、监听手势变化
#pragma mark LongPressMethod
-(void)longPressMethod:(UILongPressGestureRecognizer*)gesture{
CGPoint point = [gesture locationInView:_collectionView];
switch (gesture.state) {
case UIGestureRecognizerStateBegan:
[self dragBegin:point];
break;
case UIGestureRecognizerStateChanged:
[self dragChanged:point];
break;
case UIGestureRecognizerStateEnded:
[self dragEnd];
break;
default:
break;
}
}
2.1在拖拽开始的时候找到被拖拽的item
-(void)dragBegin:(CGPoint)point{
_dragingIndexPath = [self getDragingIndexPathWithPoint:point];
if (!_dragingIndexPath) {return;}
[_collectionView bringSubviewToFront:_dragingItem];
ZQVariableMenuCell *item = (ZQVariableMenuCell*)[_collectionView cellForItemAtIndexPath:_dragingIndexPath];
item.isMoving = true;
item.hidden = YES;
//更新被拖拽的item
_dragingItem.hidden = false;
_dragingItem.frame = item.frame;
_dragingItem.title = item.title;
_dragingItem.imageName = item.imageName;
[_dragingItem setTransform:CGAffineTransformMakeScale(1.1, 1.1)];
}
2.2拖拽过程中交换位置及更新数据源
-(void)dragChanged:(CGPoint)point{
if (!_dragingIndexPath) {return;}
_dragingItem.center = point;
_targetIndexPath = [self getTargetIndexPathWithPoint:point];
//交换位置 如果没有找到_targetIndexPath则不交换位置
if (_dragingIndexPath && _targetIndexPath) {
//更新数据源
[self rearrangeInUseTitles];
//更新item位置
[_collectionView moveItemAtIndexPath:_dragingIndexPath toIndexPath:_targetIndexPath];
_dragingIndexPath = _targetIndexPath;
}
}
2.3拖拽结束后更新itemframe及状态
//拖拽结束
-(void)dragEnd{
if (!_dragingIndexPath) {return;}
CGRect endFrame = [_collectionView cellForItemAtIndexPath:_dragingIndexPath].frame;
[_dragingItem setTransform:CGAffineTransformMakeScale(1.0, 1.0)];
[UIView animateWithDuration:0.3 animations:^{
_dragingItem.frame = endFrame;
}completion:^(BOOL finished) {
_dragingItem.hidden = true;
ZQVariableMenuCell *item = (ZQVariableMenuCell*)[_collectionView cellForItemAtIndexPath:_dragingIndexPath];
item.isMoving = false;
item.hidden = NO;
}];
}
获取当前拖动item的IndexPath方法这里我设置的只剩一个的时候和待选菜单不可排序,需要固定位置的前几个item不需要排序.
-(NSIndexPath*)getDragingIndexPathWithPoint:(CGPoint)point{
NSIndexPath* dragIndexPath = nil;
//最后剩一个不可以排序
if ([_collectionView numberOfItemsInSection:0] == 1) {return dragIndexPath;}
for (NSIndexPath *indexPath in _collectionView.indexPathsForVisibleItems) {
//下半部分不需要排序
if (indexPath.section > 0) {continue;}
//需要固定位置的前几个item不需要排序
if (indexPath.row<self.fixedNum) {continue;}
//在上半部分中找出相对应的Item
if (CGRectContainsPoint([_collectionView cellForItemAtIndexPath:indexPath].frame, point)) {
if (indexPath.row != 0) {
dragIndexPath = indexPath;
}
break;
}
}
return dragIndexPath;
}
获取目标IndexPath的方法
-(NSIndexPath*)getTargetIndexPathWithPoint:(CGPoint)point{
NSIndexPath *targetIndexPath = nil;
for (NSIndexPath *indexPath in _collectionView.indexPathsForVisibleItems) {
//如果是自己不需要排序
if ([indexPath isEqual:_dragingIndexPath]) {continue;}
//第二组不需要排序
if (indexPath.section > 0) {continue;}
//需要固定位置的前几个item不需要排序
if (indexPath.row<self.fixedNum) { continue; }
//在第一组中找出将被替换位置的Item
if (CGRectContainsPoint([_collectionView cellForItemAtIndexPath:indexPath].frame, point)) {
if (indexPath.row != 0) {
targetIndexPath = indexPath;
}
}
}
return targetIndexPath;
}
在demo里我做了个数据存储，记住用户当前的选择
1、路径
#define ShowMenusPath [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)firstObject] stringByAppendingPathComponent:@"Menus.txt"]
2、取出存储的数据
_currentMenus = [NSArray arrayWithContentsOfFile:ShowMenusPath];
3、存储改变后的数据
[[ZQVariableMenuControl shareControl] showChannelViewWithInUseTitles:_currentMenus unUseTitles:UnShowMenus fixedNum:1 finish:^(NSArray *inUseTitles, NSArray *unUseTitles) {
[inUseTitles writeToFile:ShowMenusPath atomically:YES];
[self reloadCollectionView];
}];
可以根据自己实际需要去自定义item，有什么疑问可以在评论区问我
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