#import <UIKit/UIKit.h>@class FWEffectBar, FWEffectBarItem;@protocol FWEffectBarDelegate <NSObject>
- (void)effectBar:(FWEffectBar *)bar didSelectItemAtIndex:(NSInteger)index;@end@interface FWEffectBar : UIScrollView@property (nonatomic, assign) id<FWEffectBarDelegate> delegate;
@property (nonatomic, copy) NSArray *items;
@property (nonatomic, weak) FWEffectBarItem *selectedItem;
@property UIEdgeInsets contentEdgeInsets;/*** Sets the height of tab bar.*/
- (void)setHeight:(CGFloat)height;/*** Returns the minimum height of tab bar's items.*/
- (CGFloat)minimumContentHeight;@end

//
//  FWEffectBar.m
//  FWMeituApp
//
//  Created by ForrestWoo on 15-9-23.
//  Copyright (c) 2015年 ForrestWoo co,.ltd. All rights reserved.
//

#import "FWEffectBar.h"
#import "FWEffectBarItem.h"@interface FWEffectBar ()@property (nonatomic) CGFloat itemWidth;@end@implementation FWEffectBar- (id)initWithFrame:(CGRect)frame {self = [super initWithFrame:frame];if (self) {}return self;
}- (id)initWithCoder:(NSCoder *)aDecoder {self = [super initWithCoder:aDecoder];if (self) {}return self;
}- (id)init {return [self initWithFrame:CGRectZero];
}- (void)layoutSubviews {CGSize frameSize = self.frame.size;CGFloat minimumContentHeight = [self minimumContentHeight];[self setItemWidth:roundf((frameSize.width - [self contentEdgeInsets].left -[self contentEdgeInsets].right) / [[self items] count])];NSInteger index = 0;// Layout itemsfor (FWEffectBarItem *item in [self items]) {CGFloat itemHeight = [item itemHeight];if (!itemHeight) {itemHeight = frameSize.height;}[item setFrame:CGRectMake(self.contentEdgeInsets.left + (index * self.itemWidth),roundf(frameSize.height - itemHeight) - self.contentEdgeInsets.top,self.itemWidth, itemHeight - self.contentEdgeInsets.bottom)];[item setNeedsDisplay];index++;}
}#pragma mark - Configuration- (void)setItemWidth:(CGFloat)itemWidth {if (itemWidth > 0) {_itemWidth = itemWidth;}
}- (void)setItems:(NSArray *)items {for (FWEffectBarItem *item in _items) {[item removeFromSuperview];}_items = [items copy];for (FWEffectBarItem *item in _items) {[item addTarget:self action:@selector(tabBarItemWasSelected:) forControlEvents:UIControlEventTouchDown];[self addSubview:item];}
}- (void)setHeight:(CGFloat)height {[self setFrame:CGRectMake(CGRectGetMinX(self.frame), CGRectGetMinY(self.frame),CGRectGetWidth(self.frame), height)];
}- (CGFloat)minimumContentHeight {CGFloat minimumTabBarContentHeight = CGRectGetHeight([self frame]);for (FWEffectBarItem *item in [self items]) {CGFloat itemHeight = [item itemHeight];if (itemHeight && (itemHeight < minimumTabBarContentHeight)) {minimumTabBarContentHeight = itemHeight;}}return minimumTabBarContentHeight;
}#pragma mark - Item selection- (void)tabBarItemWasSelected:(id)sender {[self setSelectedItem:sender];if ([[self delegate] respondsToSelector:@selector(effectBar:didSelectItemAtIndex:)]) {NSInteger index = [self.items indexOfObject:self.selectedItem];[[self delegate] effectBar:self didSelectItemAtIndex:index];}
}- (void)setSelectedItem:(FWEffectBarItem *)selectedItem {if (selectedItem == _selectedItem) {return;}[_selectedItem setSelected:NO];_selectedItem = selectedItem;[_selectedItem setSelected:YES];
}@end

//
//  FWEffectBarItem.h
//  FWMeituApp
//
//  Created by ForrestWoo on 15-9-23.
//  Copyright (c) 2015年 ForrestWoo co,.ltd. All rights reserved.
//

#import <UIKit/UIKit.h>@interface FWEffectBarItem : UIControl/*** itemHeight is an optional property. When set it is used instead of tabBar's height.*/
@property CGFloat itemHeight;#pragma mark - Title configuration/*** The title displayed by the tab bar item.*/
@property (nonatomic, copy) NSString *title;/*** The offset for the rectangle around the tab bar item's title.*/
@property (nonatomic) UIOffset titlePositionAdjustment;/*** For title's text attributes see* https://developer.apple.com/library/ios/documentation/uikit/reference/NSString_UIKit_Additions/Reference/Reference.html*//*** The title attributes dictionary used for tab bar item's unselected state.*/
@property (copy) NSDictionary *unselectedTitleAttributes;/*** The title attributes dictionary used for tab bar item's selected state.*/
@property (copy) NSDictionary *selectedTitleAttributes;#pragma mark - Image configuration/*** The offset for the rectangle around the tab bar item's image.*/
@property (nonatomic) UIOffset imagePositionAdjustment;/*** The image used for tab bar item's selected state.*/
- (UIImage *)finishedSelectedImage;/*** The image used for tab bar item's unselected state.*/
- (UIImage *)finishedUnselectedImage;/*** Sets the tab bar item's selected and unselected images.*/
- (void)setFinishedSelectedImage:(UIImage *)selectedImage withFinishedUnselectedImage:(UIImage *)unselectedImage;#pragma mark - Background configuration/*** The background image used for tab bar item's selected state.*/
- (UIImage *)backgroundSelectedImage;/*** The background image used for tab bar item's unselected state.*/
- (UIImage *)backgroundUnselectedImage;/*** Sets the tab bar item's selected and unselected background images.*/
- (void)setBackgroundSelectedImage:(UIImage *)selectedImage withUnselectedImage:(UIImage *)unselectedImage;@end

//
//  FWEffectBarItem.m
//  FWMeituApp
//
//  Created by ForrestWoo on 15-9-23.
//  Copyright (c) 2015年 ForrestWoo co,.ltd. All rights reserved.
//

#import "FWEffectBarItem.h"@interface FWEffectBarItem ()
{NSString *_title;UIOffset _imagePositionAdjustment;NSDictionary *_unselectedTitleAttributes;NSDictionary *_selectedTitleAttributes;
}@property UIImage *unselectedBackgroundImage;
@property UIImage *selectedBackgroundImage;
@property UIImage *unselectedImage;
@property UIImage *selectedImage;@end@implementation FWEffectBarItem- (id)initWithFrame:(CGRect)frame
{if (self = [super initWithFrame:frame]) {[self commonInitialization];}return self;
}- (id)initWithCoder:(NSCoder *)aDecoder
{if (self = [super initWithCoder:aDecoder]) {[self commonInitialization];}return self;
}- (id)init
{return [self initWithFrame:CGRectZero];
}- (void)commonInitialization {// Setup defaults
    [self setBackgroundColor:[UIColor clearColor]];_title = @"";_titlePositionAdjustment = UIOffsetZero;if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_6_1) {_unselectedTitleAttributes = @{NSFontAttributeName: [UIFont systemFontOfSize:12],NSForegroundColorAttributeName: [UIColor whiteColor],};} else {
#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0_unselectedTitleAttributes = @{UITextAttributeFont: [UIFont systemFontOfSize:12],UITextAttributeTextColor: [UIColor blackColor],};
#endif}_selectedTitleAttributes = [_unselectedTitleAttributes copy];
}- (void)drawRect:(CGRect)rect
{CGSize frameSize = self.frame.size;CGSize imageSize = CGSizeZero;CGSize titleSize = CGSizeZero;NSDictionary *titleAttributes = nil;UIImage *backgroundImage = nil;UIImage *image = nil;CGFloat imageStartingY = 0.0f;if ([self isSelected]) {image = [self selectedImage];backgroundImage = [self selectedBackgroundImage];titleAttributes = [self selectedTitleAttributes];if (!titleAttributes) {titleAttributes = [self unselectedTitleAttributes];}} else {image = [self unselectedImage];backgroundImage = [self unselectedBackgroundImage];titleAttributes = [self unselectedTitleAttributes];}imageSize = [image size];CGContextRef context = UIGraphicsGetCurrentContext();CGContextSaveGState(context);[backgroundImage drawInRect:self.bounds];// Draw image and titleif (![_title length]) {[image drawInRect:CGRectMake(roundf(frameSize.width / 2 - imageSize.width / 2) +_imagePositionAdjustment.horizontal,roundf(frameSize.height / 2 - imageSize.height / 2) +_imagePositionAdjustment.vertical,imageSize.width, imageSize.height)];} else {if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_6_1) {CGSize ts = CGSizeMake(frameSize.width, 20);titleSize = [_title boundingRectWithSize:tsoptions:NSStringDrawingUsesLineFragmentOriginattributes:titleAttributescontext:nil].size;imageStartingY = roundf((frameSize.height - imageSize.height - titleSize.height) / 2);CGRect frame = CGRectMake(roundf(frameSize.width / 2 - imageSize.width / 2) +_imagePositionAdjustment.horizontal,imageStartingY + _imagePositionAdjustment.vertical,imageSize.width, imageSize.height);[image drawInRect:frame];
//            NSLog(@"image frame:%@,%f,%f", NSStringFromCGRect(CGRectMake(roundf(frameSize.width / 2 - imageSize.width / 2) +
//                                                                         _imagePositionAdjustment.horizontal,
//                                                                         imageStartingY + _imagePositionAdjustment.vertical,
//                                                                         imageSize.width, imageSize.height)),imageStartingY,_imagePositionAdjustment.vertical);
            CGContextSetFillColorWithColor(context, [titleAttributes[NSForegroundColorAttributeName] CGColor]);CGRect frame1 = CGRectMake(roundf(frameSize.width / 2 - titleSize.width / 2) +_titlePositionAdjustment.horizontal,imageStartingY + imageSize.height + _titlePositionAdjustment.vertical,titleSize.width, titleSize.height);
//            NSLog(@"text frame:%@", NSStringFromCGRect(frame1));
//            NSLog(@"self frame:%@", NSStringFromCGRect(rect));
            [_title drawInRect:frame1withAttributes:titleAttributes];} else {
#if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_7_0titleSize = [_title sizeWithFont:titleAttributes[UITextAttributeFont]constrainedToSize:CGSizeMake(frameSize.width, 20)];UIOffset titleShadowOffset = [titleAttributes[UITextAttributeTextShadowOffset] UIOffsetValue];imageStartingY = roundf((frameSize.height - imageSize.height - titleSize.height) / 2);[image drawInRect:CGRectMake(roundf(frameSize.width / 2 - imageSize.width / 2) +_imagePositionAdjustment.horizontal,imageStartingY + _imagePositionAdjustment.vertical,imageSize.width, imageSize.height)];CGContextSetFillColorWithColor(context, [titleAttributes[UITextAttributeTextColor] CGColor]);UIColor *shadowColor = titleAttributes[UITextAttributeTextShadowColor];if (shadowColor) {CGContextSetShadowWithColor(context, CGSizeMake(titleShadowOffset.horizontal, titleShadowOffset.vertical),1.0, [shadowColor CGColor]);}[_title drawInRect:CGRectMake(roundf(frameSize.width / 2 - titleSize.width / 2) +_titlePositionAdjustment.horizontal,imageStartingY + imageSize.height + _titlePositionAdjustment.vertical,titleSize.width, titleSize.height)withFont:titleAttributes[UITextAttributeFont]lineBreakMode:NSLineBreakByTruncatingTail];
#endif}}CGContextRestoreGState(context);
}- (UIImage *)finishedSelectedImage
{return [self selectedImage];
}- (UIImage *)finishedUnselectedImage
{return [self unselectedImage];
}- (void)setFinishedSelectedImage:(UIImage *)selectedImage withFinishedUnselectedImage:(UIImage *)unselectedImage
{if (selectedImage && (selectedImage != [self selectedImage])) {[self setSelectedImage:selectedImage];}if (unselectedImage && (unselectedImage != [self unselectedImage])) {[self setUnselectedImage:unselectedImage];}
}- (UIImage *)backgroundSelectedImage {return [self selectedBackgroundImage];
}- (UIImage *)backgroundUnselectedImage {return [self unselectedBackgroundImage];
}- (void)setBackgroundSelectedImage:(UIImage *)selectedImage withUnselectedImage:(UIImage *)unselectedImage {if (selectedImage && (selectedImage != [self selectedBackgroundImage])) {[self setSelectedBackgroundImage:selectedImage];}if (unselectedImage && (unselectedImage != [self unselectedBackgroundImage])) {[self setUnselectedBackgroundImage:unselectedImage];}
}@end