对于做scrollview的下拉菜单做法

在网上搜了好多对于做下拉菜单的代码，大部分都是做tableview的下拉菜单或者是抄袭，对于大牛们所说的简单类似于tableview的说法，我觉得没那么简单。琢磨了好久，还是用这个方法做了一个scrollview下拉菜单的例子，另外添加点击转跳用的是按钮转跳没有用cell事件注意了。

首先要创建一个uiview文件，设置好需要做的scrollview样板这里就给小菜们手打一个样板

.h文件里

#import <UIKit/UIKit.h>
@class AEArtStudioController;//因为是交叉使用函数所以用@class来引用
@interface PullDownVIew : UIView<UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>
{
    AEArtStudioController *m_studio_control;//执行点击转跳的页面（文件名*函数名）
}

@property (strong, nonatomic)UICollectionView *collectionView;
@property (nonatomic,strong) NSString *cellString;
@property (nonatomic,retain) NSArray *scrollviewArray;

-(id)initWithFrame:(CGRect)frame :(AEArtStudioController *)studio_control;

@end

.m文件里

- (id)initWithFrame:(CGRect)frame :(AEArtStudioController *)studio_control
{
    self = [super initWithFrame:frame];
    if (self)
    {
        m_studio_control = studio_control;//执行转跳赋值
        self.backgroundColor=[[UIColor blackColor] colorWithAlphaComponent:0.5];
        [self collectionView_pull];//要执行的collectionview内容添加到本函数里
        self.scrollviewArray = @[@"北京市", @"天津市",@"上海市",@"重庆市",@"黑龙江",@"吉林省",@"辽宁省",@"内蒙古",@"河北省",@"山东省",@"江苏省",@"浙江省",@"福建省",@"台湾省",@"广东省",@"江西省",@"湖南省",@"安徽省",@"湖北省",@"河南省",@"山西省",@"宁夏",@"陕西省",@"甘肃省",@"青海省",@"四川省",@"贵州省",@"云南省",@"广西",@"西藏",@"新疆"];
     
    
    }
    return self;
}
//继续编写collectionView

-(void)collectionView_pull

{

//确定是水平滚动，还是垂直滚动

UICollectionViewFlowLayout *flowLayout=[[UICollectionViewFlowLayoutalloc] init];

[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];

self.collectionView=[[UICollectionViewalloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, 330) collectionViewLayout:flowLayout];

self.collectionView.dataSource=self;

self.collectionView.delegate=self;

[self.collectionViewsetBackgroundColor:[UIColorcolorWithRed:250.0green:250.0blue:250.0alpha:0.9]];

//注册Cell，必须要有

[self.collectionViewregisterClass:[UICollectionViewCellclass] forCellWithReuseIdentifier:@"UICollectionViewCell"];

[selfaddSubview:self.collectionView];

}

//定义展示的UICollectionViewCell的个数

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

return (_scrollviewArray.count);

// return [self.ViewControllerArry count];

}

//定义展示的Section的个数

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView

{

return1;

}

//每个UICollectionView展示的内容

-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

{

staticNSString * CellIdentifier = @"UICollectionViewCell";

UICollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];

cell.backgroundColor = [UIColorclearColor];

UIButton *labelBtn = [UIButtonbuttonWithType:UIButtonTypeRoundedRect];

// 按钮位置

labelBtn.frame = CGRectMake(0, 0, 85, 30);

[labelBtn setTitle:@""forState:UIControlStateNormal];

// 字体位置

[labelBtn setTitleEdgeInsets:UIEdgeInsetsMake(5, 10, 5, 10)];

labelBtn.titleLabel.font = [UIFontsystemFontOfSize: 16.0];

[labelBtn setTitleColor:[UIColorgrayColor] forState:UIControlStateNormal];

labelBtn.backgroundColor = [UIColorwhiteColor];

// 设置Button圆角

[labelBtn.layersetMasksToBounds:YES];

[labelBtn.layersetCornerRadius:3.0]; //设置矩形四个圆角半径

[labelBtn addTarget:selfaction:@selector(jump_city) forControlEvents:UIControlEventTouchUpInside];

UILabel *label = [[UILabelalloc]initWithFrame:CGRectMake(17, 2, 60, 30)];

label.textColor = [UIColorblackColor];

label.text =[self.scrollviewArrayobjectAtIndex:[indexPath row]];

label.backgroundColor =[UIColorcolorWithRed:221.0green:219.0blue:218.0alpha:0.7];

[labelBtn addSubview:label ];

[cell.contentViewaddSubview:labelBtn];

return cell;

}

//定义每个Item 的大小

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

{

returnCGSizeMake(73, 30);

// 上下间距

}

//定义每个UICollectionView 的 margin

-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section

{

returnUIEdgeInsetsMake(5, 20, 80,30);

// 上坐下有

}

-(void)jump_city//点击转跳翻页

{

AE_draw_info_right *infoLeft =[[AE_draw_info_rightalloc]init];

infoLeft.title =@"画室";

[m_studio_control.navigationControllerpushViewController:infoLeft animated:true];

}

@end

//点击事件的页面自己设置就可以了，大概思路就是在那个要展示的页面里的在新建的文件里的加入（.h文件里）

{PullDownVIew *m_pullDownView;}

- (void)viewDidLoad里创建一个按钮或label，然后在本函数viewDidLoad里设置一个下拉页面下拉位置

m_pullDownView = [[PullDownVIewalloc]initWithFrame:CGRectMake(0, -330, self.view.frame.size.width, 100) : self];

[self.view addSubview:m_pullDownView];

//注意是在（- (void)viewDidLoad里添加label）

//如果是按钮那就添加点击事件，如果是label那就添加手势动作。就不一一列举了，按钮最常见，那就举个label吧在-(void)viewDidLoad创建label。

UILabel *areaLabel = [[UILabelalloc] initWithFrame:CGRectMake(self.view.frame.size.width/2-40, 0, 80, 40)];

areaLabel.backgroundColor = [UIColorclearColor];

areaLabel.textColor = [UIColorwhiteColor];

areaLabel.textAlignment = NSTextAlignmentCenter;

areaLabel.font = [UIFontsystemFontOfSize:20.f];

areaLabel.text = @"AAA";

[titleView addSubview:imageViewtitle];

[titleView addSubview:areaLabel];

//给label添加一个点击事件手势

UITapGestureRecognizer *tapGes = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(tapSelectProvinceView)];

[titleView addGestureRecognizer:tapGes];

}

//点击事件

- (void)tapSelectProvinceView

{

NSLog(@"tapSelectProvinceView");

[UIViewanimateWithDuration:0.2animations:^{

if(m_pullDownView.frame.origin.y == -330)

{

CGRect frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

m_pullDownView.frame = frame;

}

elseif(m_pullDownView.frame.origin.y == 0) {

CGRect frame = CGRectMake(0, -330, self.view.frame.size.width, 100);

m_pullDownView.frame = frame;

}

}];

对于做scrollview的下拉菜单做法

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