ACTabScrollView

A fancy Menu and Pager UI extends UIScrollView with elegant, smooth and synchronized scrolling tabs.

DEMO

User can interact with the UI by some different gestures. The tabs and pages will always scroll synchronously.

Swipe pages normally
Drag tabs can quickly move pages
Click a tab to change to that page

You can also use changePageToIndex method to scroll pages programmatically.

Usage

###Add an Object of ACTabScrollView

Drag a UIView object onto the Interface Builder and set the Class to extends ACTabScrollView in XIB or Storyboard.

You can also set properties at Interface Builder.

And remember to declare the IBOutlet.

@IBOutlet weak var tabScrollView: ACTabScrollView!

###Set Properties

All the following properties are optional. It provides more flexibility to customize. But it will be fine if you don't change any property.

override func viewDidLoad() {
    super.viewDidLoad()
    
    // all the following properties are optional
    tabScrollView.defaultPage = 3
    tabScrollView.arrowIndicator = true
    tabScrollView.tabSectionHeight = 40
    tabScrollView.tabSectionBackgroundColor = UIColor.whiteColor()
    tabScrollView.contentSectionBackgroundColor = UIColor.whiteColor()
    tabScrollView.tabGradient = true
    tabScrollView.pagingEnabled = true
    tabScrollView.cachedPageLimit = 3
    
    ...
}

###Delegate and DataSource

Set Delegate and DataSource first in viewDidLoad(), the usage is similar to UITableView.

override func viewDidLoad() {
    ...
    
    tabScrollView.delegate = self
    tabScrollView.dataSource = self
    
    ...
}

Prepare all the content views in viewDidLoad() may be a good idea. We had better not create the content view at each page change because it may cause performance issues.

override func viewDidLoad() {
    ...
    
	// create content views from storyboard
	let storyboard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
	for i in 0 ..< /* number of pages */ {
	    let vc = storyboard.instantiateViewControllerWithIdentifier("ContentViewController") as! ContentViewController
	    
	    /* set somethings for vc */
	    
	    addChildViewController(vc) // don't forget, it's very important
	    contentViews.append(vc.view)
	}
	
	...
}

And implement methods

// MARK: ACTabScrollViewDelegate
func tabScrollView(tabScrollView: ACTabScrollView, didChangePageTo index: Int) {
    print(index)
}
    
func tabScrollView(tabScrollView: ACTabScrollView, didScrollPageTo index: Int) {
}
    
// MARK: ACTabScrollViewDataSource
func numberOfPagesInTabScrollView(tabScrollView: ACTabScrollView) -> Int {
    return /* number of pages */
}
    
func tabScrollView(tabScrollView: ACTabScrollView, tabViewForPageAtIndex index: Int) -> UIView {
    // create a label
    let label = UILabel()
    label.text = /* tab title at {index} */
    label.textAlignment = .Center
    
    // if the size of your tab is not fixed, you can adjust the size by the following way.
    label.sizeToFit() // resize the label to the size of content
    label.frame.size = CGSize(
        width: label.frame.size.width + 28, 
        height: label.frame.size.height + 36) // add some paddings
    
    return label
}
    
func tabScrollView(tabScrollView: ACTabScrollView, contentViewForPageAtIndex index: Int) -> UIView {
    return contentViews[index]
}

The usage tutorial is finished, you can see more details and example at ACTabScrollView/NewsViewController.swift

###Using ACTabScrollView in Objective-C Project

It is very very easy if you use the newest version of Xcode.

First, import the automatically generated header ACTabScrollView-Swift.h in your .m file.

#import "ACTabScrollView-Swift.h"

This header is generated automatically, you don't need to change any setting.

And try to use ACTabScrollView in your ViewController.m

#import "ViewController.h"
#import "ACTabScrollView-Swift.h"

@interface ViewController ()
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    ACTabScrollView *tabScrollView = [[ACTabScrollView alloc] init];
    
    tabScrollView.defaultPage = 3;
    tabScrollView.arrowIndicator = true;
}

@end

Enjoy ACTabScrollView in your Objective-C project. 🎉

How to Install

###CocoaPods

If you didn't use CocoaPods before, install it first.

$ gem install cocoapods
$ pod setup

Create a file named Podfile in your project folder if this file doesn't exist. And append the following line into your Podfile.

pod 'ACTabScrollView', :git => 'https://github.com/azurechen/ACTabScrollView.git'

Then, run this command. 🎉

$ pod install

###Manual

Drag these two files into your project.

Sources/ACTabScrollView.swift
Sources/ACTabScrollView+Protocol.swift

And you can use ACTabScrollView. 🎉

Inspiration

The Stackoverflow Question inspired me to create this repo. Although ACTabScrollView does not implement all the features it mentions, such as Infinite Scrolling, I will keep to implement that. But the idea give me a motivation to do something, and brought ACTabScrollView here.

I use the UI from that question as examples in this project, because that is the best sample to show this concept, and only as an example. I always want to know what the app is but I still don't figure out.

If you create the app and you don't like me to use it as an example. Contact me and I will immediately remove that. Or I can mention you and your work at README and example files. Thank you very much!

License

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.