add a podspec file

WMPageController.podspec

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+Pod::Spec.new do |s|
+   s.name         = "WMPageController"
+   s.version      = "1.0.0"
+   s.summary      = "An easy solution to page controllers like NetEase News"
+   s.homepage     = "https://github.com/wangmchn/WMPageController"
+   s.license      = 'MIT (LICENSE)'
+   s.author       = { "wangmchn" => "[email protected]" }
+   s.source       = { :git => "https://github.com/wangmchn/WMPageController.git", :tag => "1.0.0" }
+   s.platform     = :ios, '5.0'
+
+   s.source_files = 'WMPageController', 'WMPageController/**/*.{h,m}'
+   s.exclude_files = 'WMPageControllerDemo'
+
+   s.frameworks = 'Foundation', 'CoreGraphics', 'UIKit'
+   s.requires_arc = true
+ end

WMPageControllerDemo/WMPageController/WMPageController/WMMenuView/WMMenuItem.h

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+//
+//  WMMenuItem.h
+//  WMPageController
+//
+//  Created by Mark on 15/4/26.
+//  Copyright (c) 2015年 yq. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+@class WMMenuItem;
+@protocol WMMenuItemDelegate <NSObject>
+@optional
+- (void)didPressedMenuItem:(WMMenuItem *)menuItem;
+@end
+
+@interface WMMenuItem : UIView
+/**
+ *  设置rate,并刷新标题状态
+ */
+@property (nonatomic, assign) CGFloat rate;
+@property (nonatomic, strong) UIFont *font;
+@property (nonatomic, strong) UIColor *titleColor;
+/**
+ *  标题
+ */
+@property (nonatomic, copy) NSString *title;
+/**
+ *  normal状态的字体大小，默认大小为15
+ */
+@property (nonatomic, assign) CGFloat normalSize;
+/**
+ *  selected状态的字体大小，默认大小为18
+ */
+@property (nonatomic, assign) CGFloat selectedSize;
+/**
+ *  normal状态的字体颜色，默认为黑色
+ *  如果要动画，必须用rgb创建
+ */
+@property (nonatomic, strong) UIColor *normalColor;
+/**
+ *  selected状态的字体颜色，默认为红色
+ *  如果要动画，必须用rgb创建
+ */
+@property (nonatomic, strong) UIColor *selectedColor;
+
+@property (nonatomic, assign, getter=isSelected) BOOL selected;
+@property (nonatomic, weak) id<WMMenuItemDelegate> delegate;
+- (void)selectedItemWithoutAnimation;
+- (void)deselectedItemWithoutAnimation;
+@end

WMPageControllerDemo/WMPageController/WMPageController/WMMenuView/WMMenuItem.m

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+//
+//  WMMenuItem.m
+//  WMPageController
+//
+//  Created by Mark on 15/4/26.
+//  Copyright (c) 2015年 yq. All rights reserved.
+//
+
+#import "WMMenuItem.h"
+#define kSelectedSize 18
+#define kNormolSize   15
+#define kAnimateStep  0.05
+#define kAnimateRate  0.1
+
+#define kBGColor        [UIColor whiteColor]
+#define kSelectedColor  [UIColor colorWithRed:168.0/255.0 green:20.0/255.0 blue:4/255.0 alpha:1]
+#define kNormalColor    [UIColor colorWithRed:0 green:0 blue:0 alpha:1]
+
+@interface WMMenuItem (){
+    CGFloat rgba[4];
+    CGFloat rgbaGAP[4];
+    BOOL    hasRGBA;
+}
+@property (nonatomic, strong) CADisplayLink *link;
+@property (nonatomic, assign) CGFloat sizeGap;
+@end
+
+@implementation WMMenuItem
+#pragma mark - Public Methods
+- (instancetype)initWithFrame:(CGRect)frame{
+    if(self = [super initWithFrame:frame]){
+        self.backgroundColor = kBGColor;
+        hasRGBA = NO;
+    }
+    return self;
+}
+- (void)setTitle:(NSString *)title{
+    _title = title;
+    [self setNeedsDisplay];
+}
+- (void)setFont:(UIFont *)font{
+    _font = font;
+    [self setNeedsDisplay];
+}
+- (void)setTitleColor:(UIColor *)titleColor{
+    _titleColor = titleColor;
+    [self setNeedsDisplay];
+}
+// 设置选中，隐式动画所在
+- (void)setSelected:(BOOL)selected{
+    _selected = selected;
+    if (self.link) return;
+    self.link = [CADisplayLink displayLinkWithTarget:self selector:@selector(changeTitle)];
+    [self.link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
+}
+// 设置rate,并刷新标题状态
+- (void)setRate:(CGFloat)rate{
+    _rate = rate;
+    [self updateFontAndRGB];
+}
+- (void)selectedItemWithoutAnimation{
+    self.titleColor = self.selectedColor;
+    self.font = [UIFont systemFontOfSize:self.selectedSize];
+    _rate = 1.0;
+    _selected = YES;
+    [self setNeedsDisplay];
+}
+- (void)deselectedItemWithoutAnimation{
+    self.titleColor = self.normalColor;
+    self.font = [UIFont systemFontOfSize:self.normalSize];
+    _rate = 0;
+    _selected = NO;
+    [self setNeedsDisplay];
+}
+#pragma mark - Lazy loading
+- (CGFloat)normalSize{
+    if (!_normalSize) {
+        _normalSize = kNormolSize;
+    }
+    return _normalSize;
+}
+- (CGFloat)selectedSize{
+    if (!_selectedSize) {
+        _selectedSize = kSelectedSize;
+    }
+    return _selectedSize;
+}
+- (CGFloat)sizeGap{
+    if (!_sizeGap) {
+        _sizeGap = self.selectedSize - self.normalSize;
+    }
+    return _sizeGap;
+}
+- (UIColor *)selectedColor{
+    if (!_selectedColor) {
+        _selectedColor = kSelectedColor;
+    }
+    return _selectedColor;
+}
+- (UIColor *)normalColor{
+    if (!_normalColor) {
+        _normalColor = kNormalColor;
+    }
+    return _normalColor;
+}
+#pragma mark - Private Methods
+// 重绘
+- (void)drawRect:(CGRect)rect {
+    if (self.title) {
+        if (self.font == nil) {
+            self.font = [UIFont systemFontOfSize:self.normalSize];
+        }
+        if (self.titleColor == nil) {
+            self.titleColor = self.normalColor;
+        }
+        NSDictionary *attrs = @{NSFontAttributeName:self.font,
+                                NSForegroundColorAttributeName:self.titleColor
+                                };
+        CGSize size = [self.title sizeWithAttributes:attrs];
+        CGFloat x = (self.frame.size.width - size.width)/2;
+        CGFloat y = (self.frame.size.height - size.height)/2;
+        [self.title drawAtPoint:CGPointMake(x, y) withAttributes:attrs];
+    }
+}
+// 记录normal的rgba值以及nor和sel的r、g、b、a的差值，以便后续使用
+- (void)setRBGA{
+    int numNormal = (int)CGColorGetNumberOfComponents(self.normalColor.CGColor);
+    int numSelected = (int)CGColorGetNumberOfComponents(self.selectedColor.CGColor);
+    if (numNormal == 4&&numSelected == 4) {
+        const CGFloat *norComponents = CGColorGetComponents(self.normalColor.CGColor);
+        const CGFloat *selComponents = CGColorGetComponents(self.selectedColor.CGColor);
+        rgba[0] = norComponents[0];
+        rgbaGAP[0] =  selComponents[0]-rgba[0];
+        rgba[1] = norComponents[1];
+        rgbaGAP[1] = selComponents[1]-rgba[1];
+        rgba[2] = norComponents[2];
+        rgbaGAP[2] = selComponents[2]-rgba[2];
+        rgba[3] = norComponents[3];
+        rgbaGAP[3] =  selComponents[3]-rgba[3];
+    }
+    hasRGBA = YES;
+}
+// 触摸事件，告诉代理被触摸(点击)
+- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
+    if ([self.delegate respondsToSelector:@selector(didPressedMenuItem:)]) {
+        [self.delegate didPressedMenuItem:self];
+    }
+}
+// 更新自身的标题的字体大小及颜色
+- (void)updateFontAndRGB{
+    if (!hasRGBA) {
+        [self setRBGA];
+    }
+    CGFloat fontSize = self.normalSize+self.sizeGap*self.rate;
+    CGFloat r = rgba[0] + rgbaGAP[0]*self.rate;
+    CGFloat g = rgba[1] + rgbaGAP[1]*self.rate;
+    CGFloat b = rgba[2] + rgbaGAP[2]*self.rate;
+    CGFloat a = rgba[3] + rgbaGAP[3]*self.rate;
+    self.titleColor = [UIColor colorWithRed:r green:g blue:b alpha:a];
+    self.font = [UIFont systemFontOfSize:fontSize];
+}
+// 隐式动画的实现
+- (void)changeTitle{
+    if (!hasRGBA) {
+        [self setRBGA];
+    }
+    if (self.isSelected) {
+        if (self.rate < 1.0f) {
+            self.rate += kAnimateRate;
+        }else{
+            [self.link invalidate];
+            self.link = nil;
+        }
+    }else{
+        if (self.rate > 0.0f) {
+            self.rate -= kAnimateRate;
+        }else{
+            [self.link invalidate];
+            self.link = nil;
+        }
+    }
+}
+
+@end

WMPageControllerDemo/WMPageController/WMPageController/WMMenuView/WMMenuView.h

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+//
+//  WMMenuView.h
+//  WMPageController
+//
+//  Created by Mark on 15/4/26.
+//  Copyright (c) 2015年 yq. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+@class WMMenuView;
+@class WMMenuItem;
+typedef enum{
+    WMMenuSlideToNextItem,
+    WMMenuSlideToFrontItem
+} WMMenuSlideType;
+
+typedef enum{
+    WMMenuViewStyleDefault,
+    WMMenuViewStyleLine
+} WMMenuViewStyle;
+
+@protocol WMMenuViewDelegate <NSObject>
+@optional
+- (void)menuView:(WMMenuView *)menu didSelesctedIndex:(NSInteger)index currentIndex:(NSInteger)currentIndex;
+- (CGFloat)menuView:(WMMenuView *)menu widthForItemAtIndex:(NSInteger)index;
+@end
+
+@interface WMMenuView : UIView
+
+@property (nonatomic, strong) NSArray *items;
+@property (nonatomic, assign) WMMenuViewStyle style;
+@property (nonatomic, weak) id<WMMenuViewDelegate> delegate;
+
+- (instancetype)initWithFrame:(CGRect)frame buttonItems:(NSArray *)items backgroundColor:(UIColor *)bgColor norSize:(CGFloat)norSize selSize:(CGFloat)selSize norColor:(UIColor *)norColor selColor:(UIColor *)selColor;
+- (void)slideMenuAtProgress:(CGFloat)progress;
+@end