ios 横向滚轮效果_iOS 横向滑动UIScrollView选择器

一：在ViewController中实例化MLPickerScrollView完成代理  ViewController.m//  OYRPickerDemo  Created by 欧阳荣 on 17/3/30.//  Copyright © 2017年 HengTaiXin. All rights reserved.//#import "ViewController.h"#import "MLPickerScrollView.h"#import "MLDemoItem.h"#import "MLDemoModel.h"#define kItemH 110#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)#define MLColor(r, g, b, a) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:(a)]#define kRGB236 MLColor(236, 73, 73, 1.0)@interface ViewController (){

MLPickerScrollView *_pickerScollView;

NSMutableArray *data;

UIButton *sureButton;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

[self setUpUI];

// [self setUpSureButton];

}

#pragma mark - UI

- (void)setUpUI

{

// 1.数据源

data = [NSMutableArray array];

NSArray *titleArray = @[@"比杆赛",@"最近洞赛",@"推杆赛",@"比洞赛",@"三人斗地主",@"四人拉斯"];

NSArray *titleImageArray = @[@"img_stroke-play",@"img_putting",@"img_nearpin",@"img_match",@"img_three-landlords",@"img_four-lars"];

for (int i = 0; i < titleArray.count; i++) {

MLDemoModel *model = [[MLDemoModel alloc] init];

model.dicountTitle = [titleArray objectAtIndex:i];

model.dicountImageName = [titleImageArray objectAtIndex:i];

[data addObject:model];

}

// 2.初始化

_pickerScollView = [[MLPickerScrollView alloc] initWithFrame:CGRectMake(0, SCREEN_HEIGHT - 350, SCREEN_WIDTH, kItemH)];

//_pickerScollView.backgroundColor = [UIColor lightGrayColor];

_pickerScollView.itemWidth = _pickerScollView.frame.size.width / 5; //刚好显示5个的宽度

_pickerScollView.itemHeight = kItemH;

_pickerScollView.firstItemX = (_pickerScollView.frame.size.width - _pickerScollView.itemWidth) * 0.5;

_pickerScollView.dataSource = self;

_pickerScollView.delegate = self;

[self.view addSubview:_pickerScollView];

// 3.刷新数据

[_pickerScollView reloadData];

// 4.滚动到对应折扣

self.discount = 2;//(NSInteger)arc4random()%10;

NSInteger number = _discount;

_pickerScollView.seletedIndex = number;

[_pickerScollView scollToSelectdIndex:number];

}

- (void)setUpSureButton

{

sureButton = [UIButton buttonWithType:UIButtonTypeCustom];

sureButton.frame = CGRectMake(15, SCREEN_HEIGHT - 200, SCREEN_WIDTH - 30, 44);

sureButton.backgroundColor = kRGB236;

sureButton.layer.cornerRadius = 22;

sureButton.layer.masksToBounds = YES;

[sureButton setTitle:@"确定" forState:UIControlStateNormal];

[sureButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

[sureButton addTarget:self action:@selector(clickSure) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:sureButton];

}

#pragma mark - Action

- (void)clickSure

{

NSLog(@"确定--选择折扣Index为%ld",(long)_pickerScollView.seletedIndex);

NSString *title;

for (int i = 0; i < data.count; i++) {

MLDemoModel *model = [data objectAtIndex:i];

if (model.dicountIndex == _pickerScollView.seletedIndex) {

title = model.dicountTitle;

}

}

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:nil delegate:self cancelButtonTitle:@"确定" otherButtonTitles:@"取消", nil];

[alert show];

}

#pragma mark - dataSource

- (NSInteger)numberOfItemAtPickerScrollView:(MLPickerScrollView *)pickerScrollView

{

return data.count;

}

- (MLPickerItem *)pickerScrollView:(MLPickerScrollView *)pickerScrollView itemAtIndex:(NSInteger)index

{

// creat

MLDemoItem *item = [[MLDemoItem alloc] initWithFrame:CGRectMake(0, 0, pickerScrollView.itemWidth, pickerScrollView.itemHeight)];

// assignment

MLDemoModel *model = [data objectAtIndex:index];

model.dicountIndex = index;//标记数据模型上的index 取出来赋值也行

item.title = model.dicountTitle;

item.imageName = model.dicountImageName;

[item setGrayTitle];

// tap

item.PickerItemSelectBlock = ^(NSInteger d){

[_pickerScollView scollToSelectdIndex:d];

};

return item;

}

- (void)pickerScrollView:(MLPickerScrollView *)menuScrollView

didSelecteItemAtIndex:(NSInteger)index{

NSLog(@" 点击后代理回调：didSelecteItemAtIndex :%ld",index);

}

#pragma mark - delegate

- (void)itemForIndexChange:(MLPickerItem *)item

{

[item changeSizeOfItem];

}

- (void)itemForIndexBack:(MLPickerItem *)item

{

[item backSizeOfItem];

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

二：封装好选择器MLPickerScrollView

#[email protected] MLPickerItem,MLPickerScrollView;@protocol [email protected] (void)pickerScrollView:(MLPickerScrollView *)menuScrollViewdidSelecteItemAtIndex:(NSInteger)index;- (void)itemForIndexChange:(MLPickerItem *)item;- (void)itemForIndexBack:(MLPickerItem *)item;@[email protected] MLPickerScrollViewDataSource- (NSInteger)numberOfItemAtPickerScrollView:(MLPickerScrollView *)pickerScrollView;- (MLPickerItem *)pickerScrollView:(MLPickerScrollView *)pickerScrollView                  itemAtIndex:(NSInteger)index;@[email protected] MLPickerScrollView : [email protected] (nonatomic, assign)NSInteger seletedIndex;@property (nonatomic, assign)CGFloat itemWidth;@property (nonatomic, assign)CGFloat itemHeight;@property (nonatomic, assign)CGFloat firstItemX;@property (nonatomic, weak)iddelegate;@property (nonatomic, weak)iddataSource;

- (void)reloadData;

- (void)scollToSelectdIndex:(NSInteger)index;

@end#define kAnimationTime .2#import "MLPickerScrollView.h"#import "MLPickerItem.h"@interface MLPickerScrollView ()@property (nonatomic,strong)UIScrollView *scrollView;

@property (nonatomic,strong)NSMutableArray *items;

@end

@implementation MLPickerScrollView

- (instancetype)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

[self setUp];

}

return self;

}

- (id)initWithCoder:(NSCoder *)aDecoder

{

self = [super initWithCoder:aDecoder];

if (self) {

[self setUp];

}

return self;

}

#pragma mark - UI

- (void)setUp

{

self.items = [NSMutableArray array];

self.scrollView = [[UIScrollView alloc] initWithFrame:

CGRectMake(0, 0, CGRectGetWidth(self.bounds), CGRectGetHeight(self.bounds))];

self.scrollView.showsHorizontalScrollIndicator = NO;

self.scrollView.showsVerticalScrollIndicator = NO;

self.scrollView.delegate = self;

self.scrollView.decelerationRate = 0.5;

self.scrollView.backgroundColor = [UIColor clearColor];

self.firstItemX = 0;

[self addSubview:self.scrollView];

}

#pragma mark - layout Items

- (void)layoutSubviews

{

NSLog(@"  ---  layoutSubviews  --- ");

[super layoutSubviews];

if (!self.items) {

return;

}

[self layoutItems];

}

- (void)layoutItems

{

NSLog(@"  ---  刷新数据后重新布局  ---  ");

// layout

self.scrollView.frame = CGRectMake(0, 0, CGRectGetWidth(self.bounds), CGRectGetHeight(self.bounds));

// item起始X值

CGFloat startX = self.firstItemX;

NSLog(@"  CGRectGetHeight(self.bounds) : %f  self.itemHeight : %f",CGRectGetHeight(self.bounds),self.itemHeight);

for (int i = 0; i < self.items.count; i++) {

MLPickerItem *item = [self.items objectAtIndex:i];

item.frame = CGRectMake(startX, CGRectGetHeight(self.bounds)-self.itemHeight, self.itemWidth, self.itemHeight);

startX += self.itemWidth;//记录x的坐标

}

// startX的坐标(所有itemWidth的和) + scrollview.width + firstItemX (0) - itemWidth * 0.5

self.scrollView.contentSize = CGSizeMake(MAX(startX+CGRectGetWidth(self.bounds)-self.firstItemX-self.itemWidth *.5, startX), CGRectGetHeight(self.bounds));

//计算滚动区间

[self setItemAtContentOffset:self.scrollView.contentOffset];

NSLog(@" self.scrollView.contentOffset.width: %f  self.scrollView.contentOffset.height: %f  self.scrollView.contentOffset.x: %f",self.scrollView.contentSize.width,self.scrollView.contentSize.height,self.scrollView.contentOffset.x);

}

#pragma mark - public Method(GetData)

- (void)reloadData

{

// remove

for (MLPickerItem *item in self.items) {

[item removeFromSuperview];

}

[self.items removeAllObjects];

// create

NSInteger count = 0;

if ([self.dataSource respondsToSelector:@selector(numberOfItemAtPickerScrollView:)]) {

count = [self.dataSource numberOfItemAtPickerScrollView:self];

}//刷新界面的时候获取items的个数

for (NSInteger i = 0; i < count; i++) {//获取到items的个数后再获取到每个items的实例对象

MLPickerItem *item = nil;

if ([self.dataSource respondsToSelector:@selector(pickerScrollView:itemAtIndex:)]) {

item = [self.dataSource pickerScrollView:self itemAtIndex:i];

}

//把每个item添加到scrollview

NSAssert(item, @"[self.dataSource pickerScrollView: itemAtIndex:index] can not nil");

item.originalSize = CGSizeMake(self.itemWidth, self.itemHeight);

[self.items addObject:item];

[self.scrollView addSubview:item];

item.index = i;//选中回调index

}

// layout

[self layoutItems];

}

- (void)scollToSelectdIndex:(NSInteger)index

{

[self selectItemAtIndex:index];

}

#pragma mark - Helper

- (void)setItemAtContentOffset:(CGPoint)offset

{

NSInteger centerIndex = roundf(offset.x / self.itemWidth);//返回最接近_X的整数

NSLog(@" setItemAtContentOffset： %ld  移动距离offset——x： %f",(long)centerIndex,offset.x);

for (int i = 0; i < self.items.count; i++) {

MLPickerItem * item = [self.items objectAtIndex:i];

[self itemInCenterBack:item];

if (centerIndex == i) {

[self itemInCenterChange:item];

_seletedIndex = centerIndex;

}

}

}

- (void)scollToItemViewAtIndex:(NSInteger)index animated:(BOOL)animated

{

CGPoint point = CGPointMake(index * _itemWidth,self.scrollView.contentOffset.y);

NSLog(@"  ---  scollToItemViewAtIndex  --- index: %ld  point: %f",index,point.x);

[UIView animateWithDuration:kAnimationTime animations:^{

[self.scrollView setContentOffset:point];

} completion:^(BOOL finished) {

[self setItemAtContentOffset:point];

}];

//先移动再让中间的变大

}

//滑动停止的时候调用这个方法

- (void)setCenterContentOffset:(UIScrollView *)scrollView

{

CGFloat offsetX = scrollView.contentOffset.x;//移动的x距离

NSLog(@" scrollView offsetX : %f",offsetX);

if (offsetX < 0) {

offsetX = self.itemWidth * 0.5;//offsetX 为负的时候就滑到第一个位置

}else if (offsetX > (self.items.count - 1) * self.itemWidth) {

offsetX = (self.items.count - 1) * self.itemWidth;

}

NSInteger value = roundf(offsetX / self.itemWidth);//滑到第几个

NSLog(@" value : %ld  offsetX : %f",value,offsetX);

[UIView animateWithDuration:kAnimationTime animations:^{

[scrollView setContentOffset:CGPointMake(self.itemWidth * value, scrollView.contentOffset.y)];//滑动到哪个就移动到哪个

} completion:^(BOOL finished) {

[self setItemAtContentOffset:scrollView.contentOffset];//然后使中间的最大

}];

}

#pragma mark - delegate

- (void)selectItemAtIndex:(NSInteger)index

{

NSLog(@"点击选中index ： %ld",index);

_seletedIndex = index;

[self scollToItemViewAtIndex:_seletedIndex animated:YES];

if (self.delegate && [self.delegate respondsToSelector:@selector(pickerScrollView:didSelecteItemAtIndex:)]) {

[self.delegate pickerScrollView:self didSelecteItemAtIndex:_seletedIndex];

}

}

- (void)itemInCenterChange:(MLPickerItem*)item

{

if ([self.delegate respondsToSelector:@selector(itemForIndexChange:)]) {

[self.delegate itemForIndexChange:item];

}

}

- (void)itemInCenterBack:(MLPickerItem*)item

{

if ([self.delegate respondsToSelector:@selector(itemForIndexBack:)]) {

[self.delegate itemForIndexBack:item];

}

}

#pragma mark - scrollViewDelegate

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

//NSLog(@"  --  scrollViewDidScroll  --  ");

for (int i = 0; i < self.items.count; i++) {

MLPickerItem * item = [self.items objectAtIndex:i];

[self itemInCenterBack:item];

}

}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

NSLog(@"  --  scrollViewDidEndDecelerating  --  ");

[self setCenterContentOffset:scrollView];

}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {

if (!decelerate) {

NSLog(@"  --  scrollViewDidEndDragging  --  ");

[self setCenterContentOffset:scrollView];

}

}

@end

三：自定义点击view放button用于点击选择按钮图片文字父类MLPickerItem，子类重写MLDemoItem

#[email protected] MLPickerItem : UIView

@property (nonatomic, assign)NSInteger index;

@property (nonatomic, assign)CGSize originalSize;

@property (nonatomic, assign)BOOL selected;

@property (nonatomic, copy) void(^PickerItemSelectBlock)(NSInteger index);

- (void)changeSizeOfItem;

- (void)backSizeOfItem;

@end#import "MLPickerItem.h"

@implementation MLPickerItem

- (instancetype)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

[self addTapGesture];

}

return self;

}

- (void)addTapGesture

{

self.backgroundColor = [UIColor clearColor];

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap)];

[self addGestureRecognizer:tap];

}

- (void)tap

{

if (self.PickerItemSelectBlock) {

self.PickerItemSelectBlock(self.index);

}

}

// 留给子类调用

- (void)changeSizeOfItem{}

- (void)backSizeOfItem{}

@end#import "MLPickerItem.h"

@interface MLDemoItem : MLPickerItem

@property (nonatomic, strong)UIButton *discount;

@property (nonatomic, copy)NSString *title;

@property (nonatomic, copy)NSString *imageName;

- (void)setRedTitle;

- (void)setGrayTitle;

@end#define kITEM_WH 60

#define MLColor(r, g, b, a) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:(a)]

#define kRGB220 MLColor(151, 151, 151, 1.0)

#define kRGB236 MLColor(51, 51, 51, 1.0)

#import "MLDemoItem.h"

#import "JXButton.h"

@implementation MLDemoItem

- (instancetype)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

[self setUI];

}

return self;

}

- (void)setUI

{

//self.backgroundColor = [UIColor greenColor];

_discount = [JXButton buttonWithType:UIButtonTypeCustom];

_discount.enabled = NO;

_discount.titleLabel.font = [UIFont systemFontOfSize:12];

//_discount.layer.borderWidth = 1.0f;

//_discount.layer.cornerRadius = kITEM_WH * 0.5;

//_discount.layer.masksToBounds = YES;

//_discount.backgroundColor = [UIColor redColor];

CGFloat itemW = kITEM_WH;

CGFloat itemH = kITEM_WH;

CGFloat itemX = (self.frame.size.width - itemW)*0.5;

CGFloat itemY = (self.frame.size.height - itemH) *0.5;

_discount.frame = CGRectMake(itemX, itemY, itemW, itemH);

[self addSubview:_discount];

}

- (void)setTitle:(NSString *)title

{

_title = title;

[_discount setTitle:title forState:UIControlStateNormal];

[_discount.titleLabel sizeToFit];

}

-(void)setImageName:(NSString *)imageName{

_imageName = imageName;

[_discount setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];

}

- (void)setRedTitle

{

//_discount.layer.borderColor = kRGB236.CGColor;

[_discount setTitleColor:kRGB236 forState:UIControlStateNormal];

}

- (void)setGrayTitle

{

//_discount.layer.borderColor = kRGB220.CGColor;

[_discount setTitleColor:kRGB220 forState:UIControlStateNormal];

}

- (void)changeSizeOfItem

{

[self setRedTitle];

CGFloat itemW = kITEM_WH + kITEM_WH*0.5;

CGFloat itemH = kITEM_WH + kITEM_WH*0.5;

CGFloat itemX = (self.frame.size.width - itemW)*0.5;

CGFloat itemY = (self.frame.size.height - itemH) *0.5;

//_discount.layer.borderWidth = 1.0f;

//_discount.layer.cornerRadius = itemW * 0.5;

//_discount.layer.masksToBounds = YES;

_discount.frame = CGRectMake(itemX, itemY, itemW, itemH);

}

- (void)backSizeOfItem

{

[self setGrayTitle];

//_discount.layer.borderWidth = 1.0f;

//_discount.layer.cornerRadius = kITEM_WH * 0.5;

//_discount.layer.masksToBounds = YES;

CGFloat itemW = kITEM_WH;

CGFloat itemH = kITEM_WH;

CGFloat itemX = (self.frame.size.width - itemW)*0.5;

CGFloat itemY = (self.frame.size.height - itemH) *0.5;

_discount.frame = CGRectMake(itemX, itemY, itemW, itemH);

}

@end

四：点击MLDemoItem自定义模型MLDemoModel

#[email protected] MLDemoModel : NSObject

@property (nonatomic, copy) NSString *dicountTitle;

@property (nonatomic, assign) NSInteger dicountIndex;

@property (nonatomic, copy) NSString *dicountImageName;

@[email protected] MLDemoModel

@end

五：自定义图片在上文字在下button：JXButton

#[email protected] JXButton : UIButton

@end#import "JXButton.h"

@implementation JXButton

-(id)initWithCoder:(NSCoder *)aDecoder{

if (self=[super initWithCoder:aDecoder]) {

[self commonInit];

}

return self;

}

-(id)initWithFrame:(CGRect)frame{

if (self=[super initWithFrame:frame]) {

[self commonInit];

}

return self;

}

-(void)commonInit{

self.titleLabel.textAlignment = NSTextAlignmentCenter;

self.imageView.contentMode = UIViewContentModeScaleAspectFit;

self.titleLabel.font = [UIFont systemFontOfSize:14];

}

-(CGRect)titleRectForContentRect:(CGRect)contentRect{

CGFloat titleX = 0;

CGFloat titleY = contentRect.size.height *0.75;

CGFloat titleW = contentRect.size.width;

CGFloat titleH = contentRect.size.height - titleY;

return CGRectMake(titleX - 10, titleY, titleW + 20, titleH);

}

-(CGRect)imageRectForContentRect:(CGRect)contentRect{

CGFloat imageW = CGRectGetWidth(contentRect);

CGFloat imageH = contentRect.size.height * 0.7;

return CGRectMake(0, 0, imageW, imageH);

}

@end