#import "CSHotTopicPagesVC.h"

#import "CSHotTopicView.h"

#import "CSMyTopicVC.h"

#import "SMPageControl.h"

@interface CSHotTopicPagesVC ()<UIScrollViewDelegate>

@property (nonatomic,strong) UIScrollView *scrollView;

@property (nonatomic,strong) SMPageControl *pageControl;

@property (nonatomic,strong) UIView *navigationBarView;

@property (nonatomic,strong)NSArray *navTitles;

@implementation CSHotTopicPagesVC

- (void)viewDidLoad {

[super viewDidLoad];

[self setupUI];

}

- (void)onGoBack {

[self.navigationController popViewControllerAnimated:YES];

}

- (void)viewWillAppear:(BOOL)animated {

[super viewWillAppear:animated];

[self.navigationController.navigationBar addSubview:self.navigationBarView];

}

-(void)viewWillDisappear:(BOOL)animated{

[super viewWillDisappear:animated];

[self.navigationBarView removeFromSuperview];

}

#pragma mark -

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

[self updateNavItems:scrollView.contentOffset.x];

float mid = [UIScreen mainScreen].bounds.size.width/2 - 45.0;

float width = [UIScreen mainScreen].bounds.size.width;

CGFloat xOffset = scrollView.contentOffset.x;

int i = 0;

for(UILabel *v in _navTitles){

CGFloat alpha = 0.0;

if(v.frame.origin.x < mid)

alpha = 1 - (xOffset - i*width) / width;

else if(v.frame.origin.x >mid)

alpha=(xOffset - i*width) / width + 1;

else if(v.frame.origin.x == mid-5)

alpha = 1.0;

i++;

v.alpha = alpha;

}

}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {

[self sendNewIndex:scrollView];

}

-(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{

[self sendNewIndex:scrollView];

}

-(void)sendNewIndex:(UIScrollView *)scrollView{

CGFloat xOffset = scrollView.contentOffset.x;

NSInteger index = ((int) roundf(xOffset) % (2 * (int)kScreen_Width)) / kScreen_Width;

if (self.pageControl.currentPage != index)

{

self.pageControl.currentPage = index;

}

}

#pragma mark -

-(void)updateNavItems:(CGFloat) xOffset{

__block int i = 0;

[_navTitles enumerateObjectsUsingBlock:^(UIView* v, NSUInteger idx, BOOL *stop) {

CGFloat distance = (kScreen_Width/2) - 60;

CGSize vSize = CGSizeMake(100, 16);

CGFloat originX = ((kScreen_Width/2 - vSize.width/2) + i*distance) - xOffset/(kScreen_Width/distance);

v.frame = (CGRect){originX, 8, vSize.width, vSize.height};

i++;

}];

}

- (void)setupUI {

self.navigationItem.title = @"";

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

self.scrollView = [[UIScrollView alloc] initWithFrame:frame];

self.scrollView.backgroundColor = [UIColor clearColor];

self.scrollView.pagingEnabled = YES;

self.scrollView.showsHorizontalScrollIndicator = NO;

self.scrollView.showsVerticalScrollIndicator = NO;

self.scrollView.delegate = self;

self.scrollView.bounces = NO;

[self.scrollView setContentInset:UIEdgeInsetsMake(0, 0, 0, 0)];

[self.view addSubview:self.scrollView];

[self.scrollView mas_makeConstraints:^(MASConstraintMaker *make) {

make.edges.equalTo(self.view);

}];

self.scrollView .clipsToBounds = YES;

self.scrollView.contentSize = CGSizeMake(kScreen_Width * 2, 0);

_navigationBarView = [[UIView alloc] initWithFrame:(CGRect){0, 0, kScreen_Width, 44}];

_navigationBarView.backgroundColor = [UIColor clearColor];

// Make the page control

self.pageControl = ({

SMPageControl *pgC = [[SMPageControl alloc] init];

pgC.userInteractionEnabled = NO;

pgC.backgroundColor = [UIColor clearColor];

pgC.pageIndicatorImage = [UIImage imageNamed:@"nav_page_unselected"];

pgC.currentPageIndicatorImage = [UIImage imageNamed:@"nav_page_selected"];

pgC.frame = CGRectMake(0, 32.0, kScreen_Width, 7.0);

pgC.numberOfPages = 2;

pgC.currentPage = 0;

pgC;

});

_navigationBarView.userInteractionEnabled = NO;

[_navigationBarView addSubview:self.pageControl];

// Adds all views

CSHotTopicView *v1 = [[CSHotTopicView alloc] initWithFrame:CGRectMake(0, 0, kScreen_Width, self.view.height - 50)];

v1.backgroundColor = [UIColor whiteColor];

CSMyTopicView *v2 = [[CSMyTopicView alloc]initWithFrame:CGRectMake(kScreen_Width+1, 0, kScreen_Width, self.view.height - 50)];

v2.backgroundColor = [UIColor whiteColor];

v1.parentVC = self;

v2.parentVC = self;

[self.scrollView addSubview:v1];

[self.scrollView addSubview:v2];

CGFloat titleWidth = 100;

CGFloat distance = (kScreen_Width/2) - 60;

UILabel *la1 = [[UILabel alloc] initWithFrame:CGRectMake((kScreen_Width/2 - titleWidth/2) + 0*distance, 8, titleWidth, 16)];

la1.text = @"热门话题";

la1.textAlignment = NSTextAlignmentCenter;

la1.font = [UIFont systemFontOfSize:16];

la1.textColor = [UIColor whiteColor];

UILabel *la2 = [[UILabel alloc] initWithFrame:CGRectMake((kScreen_Width/2 - titleWidth/2) + 1*distance, 8, titleWidth, 16)];

la2.text = @"我的话题";

la2.textAlignment = NSTextAlignmentCenter;

la2.font = [UIFont systemFontOfSize:16];

la2.textColor = [UIColor whiteColor];

la2.alpha = 0;

[_navigationBarView addSubview:la1];

[_navigationBarView addSubview:la2];

_navTitles = @[la1,la2];

}