IOS学习（十六）自定义tabBar

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#import "CustomTabBarItem.h"@implementation CustomTabBarItem+ (instancetype) itemWithFrame:(CGRect)frame title:(NSString *)title{    CustomTabBarItem *item = [CustomTabBarItem buttonWithType:UIButtonTypeCustom];    [item setFrame:frame];        [item setTitle:title forState:UIControlStateNormal];    [item.titleLabel setFont:[UIFont systemFontOfSize:17]];    [item setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];        [item setBackgroundImage:[UIImage imageNamed:@"n"] forState:UIControlStateNormal];    [item setBackgroundImage:[UIImage imageNamed:@"s"] forState:UIControlStateSelected];    return item;}@end

#import <UIKit/UIKit.h>@class CustomTabBar;//自定义协议，实现与其他类通信@protocol CustomTabBarDelegate <NSObject>- (void) tabBar:(CustomTabBar *)tabBar itemSelectedAtIndex:(NSInteger)index;@end@interface CustomTabBar : UIView@property(nonatomic, weak) id<CustomTabBarDelegate> delegate;+ (instancetype) tabBarWithTites:(NSArray *)titles;@end

#import "CustomTabBar.h"#import "CustomTabBarItem.h"static const CGFloat TabBarHeight = 44;@interface CustomTabBar()@property(nonatomic, strong) NSArray *titles;@property(nonatomic, weak) CustomTabBarItem *preSelectedItem;@end@implementation CustomTabBar+ (instancetype) tabBarWithTites:(NSArray *)titles{        CustomTabBar *tabBar = [[CustomTabBar alloc] init];        [tabBar setTitles:titles];    [tabBar setBackgroundColor:[UIColor grayColor]];                return tabBar;}- (void)willMoveToSuperview:(UIView *)newSuperview{    self.frame = CGRectMake(0, CGRectGetMaxY(newSuperview.frame) - TabBarHeight, CGRectGetWidth(newSuperview.frame), TabBarHeight);        //必须是在这里创建items，不然无法获取其frame信息    [self addItems];}- (void) addItems{    CGFloat count = self.titles.count;    CGFloat height = CGRectGetHeight(self.bounds);    CGFloat width = CGRectGetWidth(self.bounds) / count;        for (NSInteger i = 0 ; i < count ; i++){        CustomTabBarItem *item = [CustomTabBarItem itemWithFrame:CGRectMake(i * width, 0, width, height) title:self.titles[i]];        [item setTag:i];                [self addSubview:item];                //设置监听，点击按钮时        [item addTarget:self action:@selector(itemSelected:) forControlEvents:UIControlEventTouchUpInside];            }}- (void)itemSelected:(CustomTabBarItem *)send{    [self.preSelectedItem setSelected:NO];    [send setSelected:YES];        [self setPreSelectedItem:send];        [self.delegate tabBar:self itemSelectedAtIndex:send.tag];}@end

#import "MainViewController.h"#import "CustomTabBar.h"@interface MainViewController ()<CustomTabBarDelegate>@property(nonatomic, strong) UILabel *label;@property(nonatomic, strong) NSArray *titles;@end@implementation MainViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor whiteColor];        self.titles = @[@"OC", @"JAVA", @"PHP"];        CustomTabBar *tabBar = [CustomTabBar tabBarWithTites:self.titles];    self.label = [[UILabel alloc] initWithFrame:CGRectMake(60, 100, 200, 200)];    [self.label setBackgroundColor:[UIColor grayColor]];    [self.label setFont:[UIFont systemFontOfSize:60]];    [self.label setTextColor:[UIColor yellowColor]];    [self.label setTextAlignment:NSTextAlignmentCenter];    [self.label setText:@"OC"];        [self.view addSubview:tabBar];    [self.view addSubview:self.label];        [tabBar setDelegate:self];    }- (void)tabBar:(CustomTabBar *)tabBar itemSelectedAtIndex:(NSInteger)index{    [self.label setText:self.titles[index]];}@end

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