1510469-ca91e2a3ad507111.png
#import "LLSwitchBaseViewController.h"
#import "LLSwitchHead.h"
#import "UIView+Frame.h"
#import "LLSwitchViewController.h"
@interface LLSwitchBaseViewController ()<UIScrollViewDelegate>
@property (nonatomic,strong) NSArray * titleArr;
@property (nonatomic,strong) NSMutableArray *titleWidths ;
@property (nonatomic,strong) NSMutableArray * titleLableArr;
@property (nonatomic,assign) CGFloat titleMargin;
@property (nonatomic,strong) UIScrollView * titleScroll;
@property (nonatomic,strong) UIScrollView * contentScroll;
/** 下标视图 */
@property (nonatomic, strong) UIView *underLine;
/** 记录上一次内容滚动视图偏移量 */
@property (nonatomic, assign) CGFloat lastOffsetX;
@end
@implementation LLSwitchBaseViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
self.automaticallyAdjustsScrollViewInsets = false;
[self setupUI];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)setupUI {
[self.view addSubview:self.titleScroll];
[self.view addSubview:self.contentScroll];
[self setUpTitleWidth];
[self setUpAllTitle];
}
// 设置所有标题
- (void)setUpAllTitle
{
// 遍历所有的子控制器
NSUInteger count = self.titleArr.count;
// 添加所有的标题
CGFloat labelW = 0;
CGFloat labelH = 45;
CGFloat labelX = 0;
CGFloat labelY = 0;
for (int i = 0; i < count; i++) {
UILabel *label = [[UILabel alloc] init];
label.tag = i;
label.userInteractionEnabled = true;
// 设置按钮的文字颜色
label.textColor = [UIColor darkGrayColor];
label.font = LLTitleFont;
label.textAlignment = NSTextAlignmentCenter;
// 设置按钮标题
label.text = self.titleArr[i];
// 设置按钮位置
UILabel *lastLabel = [self.titleLableArr lastObject];
//如果标题栏只有两个的话,则设置屏幕各占一半
if (count < 3) {
labelW = LLScreenW / 2;
labelX = i * labelW;
}else {
labelW = [self.titleWidths[i] floatValue];
labelX = _titleMargin + CGRectGetMaxX(lastLabel.frame);
}
label.frame = CGRectMake(labelX, labelY, labelW, labelH);
// 监听标题的点击
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(titleClick:)];
[label addGestureRecognizer:tap];
// 保存到数组
[self.titleLableArr addObject:label];
[self.titleScroll addSubview:label];
//添加对应的子控制器
LLSwitchViewController * switchVc = [LLSwitchViewController new];
switchVc.title = self.titleArr[i];
[self addChildViewController:switchVc];
//设置第一个
if (i == 0) {
[self titleClick:tap];
}
}
// 设置标题滚动视图的内容范围
UILabel *lastLabel = self.titleLableArr.lastObject;
_titleScroll.contentSize = CGSizeMake(CGRectGetMaxX(lastLabel.frame), 0);
_titleScroll.showsHorizontalScrollIndicator = NO;
_contentScroll.contentSize = CGSizeMake(count * LLScreenW, 0);
}
// 标题按钮点击
- (void)titleClick:(UITapGestureRecognizer *)tap
{
for (UILabel * lable in self.titleLableArr) {
lable.textColor = [UIColor darkGrayColor];
}
// 获取对应标题label
UILabel *label = (UILabel *)tap.view;
//设置文字跟随滚动
[self setLabelTitleCenter:label];
//设置下表跟随滚动
[self setUpUnderLine:label];
// 获取当前角标
NSInteger i = label.tag;
// 选中label
label.textColor = [UIColor purpleColor];
// 内容滚动视图滚动到对应位置
CGFloat offsetX = i * LLScreenW;
LLSwitchViewController * switchVc = self.childViewControllers[i];
[self.contentScroll addSubview:switchVc.view];
switchVc.view.frame = self.contentScroll.bounds;
self.contentScroll.contentOffset = CGPointMake(offsetX, 0);
// 记录上一次偏移量,因为点击的时候不会调用scrollView代理记录，因此需要主动记录
_lastOffsetX = offsetX;
}
// 设置下标的位置
- (void)setUpUnderLine:(UILabel *)label
{
CGFloat underLineH = 2;
self.underLine.yz_y = label.yz_height - underLineH;
self.underLine.yz_height = underLineH;
// 点击时候需要动画
[UIView animateWithDuration:0.25 animations:^{
if (self.titleArr.count < 3) {
self.underLine.yz_width = LLScreenW / 2;
}else {
self.underLine.yz_width = label.yz_width;
}
self.underLine.yz_centerX = label.yz_centerX;
}];
}
// 让选中的按钮居中显示
- (void)setLabelTitleCenter:(UILabel *)label
{
// 设置标题滚动区域的偏移量
CGFloat offsetX = label.center.x - LLScreenW * 0.5;
if (offsetX < 0) {
offsetX = 0;
}
// 计算下最大的标题视图滚动区域
CGFloat maxOffsetX = self.titleScroll.contentSize.width - LLScreenW + _titleMargin;
if (self.titleArr.count < 3) { //有两个标题情况,不设置
maxOffsetX = self.titleScroll.contentSize.width - LLScreenW ;
}
if (maxOffsetX < 0) {
maxOffsetX = 0;
}
if (offsetX > maxOffsetX) {
offsetX = maxOffsetX;
}
// 滚动区域
[self.titleScroll setContentOffset:CGPointMake(offsetX, 0) animated:YES];
}
/// MARK: ---- scrollViewDidEndDecelerating
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
CGFloat offsetX = scrollView.contentOffset.x;
NSInteger offsetXInt = offsetX;
NSInteger screenWInt = LLScreenW;
NSInteger extre = offsetXInt % screenWInt;
if (extre > LLScreenW * 0.5) {
// 往右边移动
offsetX = offsetX + (LLScreenW - extre);
[self.contentScroll setContentOffset:CGPointMake(offsetX, 0) animated:YES];
}else if (extre < LLScreenW * 0.5 && extre > 0){
// 往左边移动
offsetX = offsetX - extre;
[self.contentScroll setContentOffset:CGPointMake(offsetX, 0) animated:YES];
}
// 获取角标
NSInteger i = offsetX / LLScreenW;
UILabel * currentLable = self.titleLableArr[i];
// 选中标题
[self titleClick:currentLable.gestureRecognizers.firstObject ];
}
#pragma mark - 计算所有标题宽度
// 计算所有标题宽度
- (void)setUpTitleWidth
{
// 判断是否能占据整个屏幕
NSUInteger count = self.titleArr.count;
CGFloat totalWidth = 0;
// 计算所有标题的宽度
for (NSString *title in self.titleArr) {
CGRect titleBounds = [title boundingRectWithSize:CGSizeMake(MAXFLOAT, 0) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:LLTitleFont} context:nil];
CGFloat width = titleBounds.size.width + 20;
[self.titleWidths addObject:@(width)];
totalWidth += width;
}
if (totalWidth > LLScreenW) {
_titleMargin = LLMargin;
self.titleScroll.contentInset = UIEdgeInsetsMake(0, 0, 0, _titleMargin);
return;
}
CGFloat titleMargin = (LLScreenW - totalWidth) / (count + 1);
_titleMargin = titleMargin < LLMargin? LLMargin: titleMargin;
self.titleScroll.contentInset = UIEdgeInsetsMake(0, 0, 0, _titleMargin);
}
/// MARK: ---- 懒加载方法
- (NSMutableArray *)titleWidths {
if (_titleWidths == nil) {
_titleWidths = [NSMutableArray array];
}
return _titleWidths;
}
-(UIScrollView *)titleScroll {
if (_titleScroll == nil) {
_titleScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 64, LLScreenW, 45)];
}
return _titleScroll;
}
-(UIScrollView *)contentScroll {
if (_contentScroll == nil) {
_contentScroll = [[UIScrollView alloc]initWithFrame:CGRectMake(0, CGRectGetMaxY(self.titleScroll.frame), LLScreenW, LLScreenH - 64 - 45)];
_contentScroll.delegate = self;
_contentScroll.pagingEnabled = true;
}
return _contentScroll;
}
-(NSArray *)titleArr {
if (_titleArr == nil) {
_titleArr = @[@"要闻专题视频",@"你你你你我饿我饿我饿",@"每每大",@"懒懒的",@"很爱很爱"];
}
return _titleArr;
}
-(NSMutableArray *)titleLableArr {
if (_titleLableArr == nil) {
_titleLableArr = [NSMutableArray array];
}
return _titleLableArr;
}
- (UIView *)underLine
{
if (_underLine == nil) {
_underLine = [[UIView alloc] init];
_underLine.backgroundColor = [UIColor redColor];
[self.titleScroll addSubview:_underLine];
}
return _underLine ;
}
@end
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