在我們的專案中經常會自己自定義tabBar因為蘋果自帶的真的太醜了！也不滿足我們的專案需求。
好 開始行動吧！
先上圖看下我們最終實現的效果：
繼承UItabBar自定義一個自己的tabBar
.h
#import <UIKit/UIKit.h>
@class HJTTabBar;
@protocol ZTTabBarDelegate <UITabBarDelegate>
@optional
- (void)tabBarDidClickPlusButton:(HJTTabBar *)tabBar;
@end
@interface HJTTabBar : UITabBar
@property (nonatomic, weak) id<ZTTabBarDelegate> myDelegate;
@end
複製程式碼.m
#import "HJTTabBar.h"
#import "UIBarButtonItem+Extension.h"
#import "UIView+Extension.h"
@interface HJTTabBar ()
@property (nonatomic, weak) UIButton *plusBtn;
@end
@implementation HJTTabBar
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
UIButton *plusBtn = [[UIButton alloc] init];
[plusBtn setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button"] forState:UIControlStateNormal];
[plusBtn setBackgroundImage:[UIImage imageNamed:@"tabbar_compose_button_highlighted"] forState:UIControlStateHighlighted];
[plusBtn setImage:[UIImage imageNamed:@"tabbar_compose_icon_add"] forState:UIControlStateNormal];
[plusBtn setImage:[UIImage imageNamed:@"tabbar_compose_icon_add_highlighted"] forState:UIControlStateHighlighted];
plusBtn.size = plusBtn.currentBackgroundImage.size;
[plusBtn addTarget:self action:@selector(plusBtnClick) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:plusBtn];
self.plusBtn = plusBtn;
}
return self;
}
/**
* 加號按鈕點選
*/
- (void)plusBtnClick
{
// 通知代理
if ([self.delegate respondsToSelector:@selector(tabBarDidClickPlusButton:)]) {
[self.myDelegate tabBarDidClickPlusButton:self];
}
}
/**
* 想要重新排布系統控制元件subview的佈局，推薦重寫layoutSubviews，在呼叫父類佈局後重新排布。
*/
- (void)layoutSubviews
{
[super layoutSubviews];
// 1.設定加號按鈕的位置
self.plusBtn.centerX = self.width*0.5;
self.plusBtn.centerY = self.height*0.5;
// 2.設定其他tabbarButton的frame
CGFloat tabBarButtonW = self.width / 5;
CGFloat tabBarButtonIndex = 0;
for (UIView *child in self.subviews) {
//UITabBarItem UITabBarButton
Class class = NSClassFromString(@"UITabBarItem ");
if ([child isKindOfClass:class]) {
// 設定x
child.x = tabBarButtonIndex * tabBarButtonW;
// 設定寬度
child.width = tabBarButtonW;
// 增加索引
tabBarButtonIndex++;
if (tabBarButtonIndex == 2) {
tabBarButtonIndex++;
}
}
}
}
@end
複製程式碼下面是Category：
UIView+Extension.h中：
#import <UIKit/UIKit.h>
@interface UIView (Extension)
@property (nonatomic, assign) CGFloat x;
@property (nonatomic, assign) CGFloat y;
@property (nonatomic, assign) CGFloat centerX;
@property (nonatomic, assign) CGFloat centerY;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, assign) CGSize size;
@property (nonatomic, assign) CGPoint origin;
@end
複製程式碼UIView+Extension.m中：
#import "UIView+Extension.h"
@implementation UIView (Extension)
- (void)setX:(CGFloat)x
{
CGRect frame = self.frame;
frame.origin.x = x;
self.frame = frame;
}
- (void)setY:(CGFloat)y
{
CGRect frame = self.frame;
frame.origin.y = y;
self.frame = frame;
}
- (CGFloat)x
{
return self.frame.origin.x;
}
- (CGFloat)y
{
return self.frame.origin.y;
}
- (void)setCenterX:(CGFloat)centerX
{
CGPoint center = self.center;
center.x = centerX;
self.center = center;
}
- (CGFloat)centerX
{
return self.center.x;
}
- (void)setCenterY:(CGFloat)centerY
{
CGPoint center = self.center;
center.y = centerY;
self.center = center;
}
- (CGFloat)centerY
{
return self.center.y;
}
- (void)setWidth:(CGFloat)width
{
CGRect frame = self.frame;
frame.size.width = width;
self.frame = frame;
}
- (void)setHeight:(CGFloat)height
{
CGRect frame = self.frame;
frame.size.height = height;
self.frame = frame;
}
- (CGFloat)height
{
return self.frame.size.height;
}
- (CGFloat)width
{
return self.frame.size.width;
}
- (void)setSize:(CGSize)size
{
CGRect frame = self.frame;
frame.size = size;
self.frame = frame;
}
- (CGSize)size
{
return self.frame.size;
}
- (void)setOrigin:(CGPoint)origin
{
CGRect frame = self.frame;
frame.origin = origin;
self.frame = frame;
}
- (CGPoint)origin
{
return self.frame.origin;
}
@end
複製程式碼UIBarButtonItem+Extension.h中：
#import <UIKit/UIKit.h>
@interface UIBarButtonItem (Extension)
+ (UIBarButtonItem *)itemWithTargat:(id)target action:(SEL)action image:(NSString *)image highImage:(NSString *)highImage;
@end
複製程式碼UIBarButtonItem+Extension.m中：
#import "UIBarButtonItem+Extension.h"
#import "UIView+Extension.h"
@implementation UIBarButtonItem (Extension)
/**
* 建立一個item
*
* @param target 點選item後呼叫哪個物件的方法
* @param action 點選item後呼叫target的哪個方法
* @param image 圖片
* @param highImage 高亮的圖片
*
* @return 建立完的item
*/
+ (UIBarButtonItem *)itemWithTargat:(id)target action:(SEL)action image:(NSString *)image highImage:(NSString *)highImage
{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
// 設定圖片
[btn setBackgroundImage:[UIImage imageNamed:image] forState:UIControlStateNormal];
[btn setBackgroundImage:[UIImage imageNamed:highImage] forState:UIControlStateHighlighted];
// 設定尺寸
btn.size = btn.currentBackgroundImage.size;
[btn addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
return [[UIBarButtonItem alloc] initWithCustomView:btn];
}
@end
複製程式碼接下來我們就該在需要的地方使用自定義的tabBar了
- 我是在UITabBarController中使用自定義的tabBar。
匯入#import "HJTTabBar.h"並遵循 HJTTabBarDelegate協議。
複製程式碼在- (void)viewDidLoad 中實現下面程式碼：
- (void)viewDidLoad {
[super viewDidLoad];
// 新增子控制器
[self addChildVc:[[FirstPageViewController alloc] init] title:@"首頁" image:@"tabbar_home" selectedImage:@"tabbar_home_selected"];
[self addChildVc:[[CommunityViewController alloc] init] title:@"社群" image:@"tabbar_message_center" selectedImage:@"tabbar_message_center_selected"];
[self addChildVc:[[MessageViewController alloc] init] title:@"訊息" image:@"tabbar_discover" selectedImage:@"tabbar_discover_selected"];
[self addChildVc:[[ConsultViewController alloc] init] title:@"諮詢" image:@"tabbar_profile" selectedImage:@"tabbar_profile_selected"];
HJTTabBar *tabBar = [[HJTTabBar alloc] init];
//取消tabBar的透明效果
tabBar.translucent = NO;
tabBar.myDelegate = self;
// KVC：如果要修系統的某些屬性，但被設為readOnly，就是用KVC，即setValue：forKey：。
[self setValue:tabBar forKey:@"tabBar"];
}
複製程式碼
實現下面方法：
- (void)addChildVc:(UIViewController *)childVc title:(NSString *)title image:(NSString *)image selectedImage:(NSString *)selectedImage
{
// 設定子控制器的文字(可以設定tabBar和navigationBar的文字)
childVc.title = title;
// 設定子控制器的tabBarItem圖片
childVc.tabBarItem.image = [UIImage imageNamed:image];
// 禁用圖片渲染
childVc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
// 設定文字的樣式
[childVc.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor blackColor]} forState:UIControlStateNormal];
[childVc.tabBarItem setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor redColor]} forState:UIControlStateSelected];
// childVc.view.backgroundColor = RandomColor; // 這句程式碼會自動載入主頁，訊息，發現，我四個控制器的view，但是view要在我們用的時候去提前載入
// 為子控制器包裝導航控制器
UINavigationController *navigationVc = [[UINavigationController alloc] initWithRootViewController:childVc];
// 新增子控制器
[self addChildViewController:navigationVc];
}
複製程式碼
#pragma HJTTabBarDelegate
/**
* 加號按鈕點選
*/
- (void)tabBarDidClickPlusButton:(HJTTabBar *)tabBar
{
NSLog(@"+++");
}
複製程式碼好了 完事！