本文实例为大家分享了ios滚动导航条效果展示的具体代码，供大家参考，具体内容如下
实现效果
效果：选择不同的栏目，下面出现不同的视图，栏目条可以滚动；下面的视图也可以滚动，滚动时上面对应的栏目要选中颜色为红色；
滚动的导航条包括两部分：标题滚动视图(uiscrollview)，内容滚动视图(uiscrollview)
实现代码
1.首先实现main.storyboard
2.创建多个子控制器:头条、科技、汽车、体育、视频、图片、热点
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// 头条viewcontroller, 其它控制器和这个控制器都一样，只是背景颜色不同而已#import <uikit/uikit.h>@interface toplineviewcontroller : uiviewcontroller@end//----------------------------------------------------------------#import "toplineviewcontroller.h"@interface toplineviewcontroller ()@end@implementation toplineviewcontroller- (void)viewdidload { [super viewdidload]; self.view.backgroundcolor = [uicolor blackcolor];}@end |
实现main.storyboard对应的视图控制器viewcontroller
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#import <uikit/uikit.h>@interface viewcontroller : uiviewcontroller@end//----------------------------------------------------------------#import "viewcontroller.h"#import "toplineviewcontroller.h"#import "technologyviewcontroller.h"#import "carviewcontroller.h"#import "sportsviewcontroller.h"#import "videoviewcontroller.h"#import "imageviewcontroller.h"#import "hotviewcontroller.h"#define screenwidth [uiscreen mainscreen].bounds.size.width#define screenheight [uiscreen mainscreen].bounds.size.height@interface viewcontroller () <uiscrollviewdelegate>@property (weak, nonatomic) iboutlet uiscrollview *titlescrollview;@property (weak, nonatomic) iboutlet uiscrollview *contentscrollview;@property (strong, nonatomic) nsmutablearray *buttons;@property (strong, nonatomic) uibutton *selectedbutton;@end@implementation viewcontroller- (void)viewdidload { [super viewdidload]; self.navigationitem.title = @"网易新闻"; // 1. 初始化标题滚动视图上的按钮 [self initbuttonsforbuttonscrollview];}- (void) initbuttonsforbuttonscrollview { // 初始化子控制器 [self initchildviewcontrollers]; cgfloat buttonwidth = 100; cgfloat buttonheight = 40; nsinteger childviewcontrollercount = self.childviewcontrollers.count; for (nsinteger i = 0; i < childviewcontrollercount; i++) { uiviewcontroller *childviewcontroller = self.childviewcontrollers[i]; uibutton *titlebutton = [uibutton buttonwithtype:uibuttontypecustom]; titlebutton.tag = i; cgfloat x = i * buttonwidth; titlebutton.frame = cgrectmake(x, 0, buttonwidth, buttonheight); [titlebutton settitle:childviewcontroller.title forstate:uicontrolstatenormal]; [titlebutton settitlecolor:[uicolor blackcolor] forstate:uicontrolstatenormal]; [titlebutton addtarget:self action:@selector(titlebuttononclick:) forcontrolevents:uicontroleventtouchupinside]; [self.titlescrollview addsubview:titlebutton]; [self.buttons addobject:titlebutton]; } self.titlescrollview.contentsize = cgsizemake(buttonwidth * childviewcontrollercount, 0); self.titlescrollview.showshorizontalscrollindicator = no; self.titlescrollview.bounces = no; self.contentscrollview.contentsize = cgsizemake(screenwidth * childviewcontrollercount, 0); self.contentscrollview.showshorizontalscrollindicator = no; self.contentscrollview.pagingenabled = yes; self.contentscrollview.delegate = self; // 禁止额外滚动区域 self.automaticallyadjustsscrollviewinsets = no; // 初始化时默认选中第一个 [self titlebuttononclick:self.buttons[0]];}- (void)titlebuttononclick:(uibutton *)button { // 1. 选中按钮 [self selectingbutton:button]; // 2. 显示子视图 [self addviewtocontentscrollview:button];}- (void)selectingbutton:(uibutton *)button { [_selectedbutton settitlecolor:[uicolor blackcolor] forstate:uicontrolstatenormal]; _selectedbutton.transform = cgaffinetransformmakescale(1.0, 1.0); [button settitlecolor:[uicolor redcolor] forstate:uicontrolstatenormal]; button.transform = cgaffinetransformmakescale(1.3, 1.3); // 选中字体变大，按钮变大，字体也跟着变大 _selectedbutton = button; // 选中按钮时要让选中的按钮居中 cgfloat offsetx = button.frame.origin.x - screenwidth * 0.5; cgfloat maxoffsetx = self.titlescrollview.contentsize.width - screenwidth; if (offsetx < 0) { offsetx = 0; } else if (offsetx > maxoffsetx) { offsetx = maxoffsetx; } [self.titlescrollview setcontentoffset:cgpointmake(offsetx, 0) animated:yes];}- (void)addviewtocontentscrollview:(uibutton *)button { nsinteger i = button.tag; uiviewcontroller *childviewcontroller = self.childviewcontrollers[i]; cgfloat x = i * screenwidth; // 防止添加多次 if (childviewcontroller.view.subviews != nil) { childviewcontroller.view.frame = cgrectmake(x, 0, screenwidth, screenheight); [self.contentscrollview addsubview:childviewcontroller.view]; } self.contentscrollview.contentoffset = cgpointmake(x, 0);}#pragma mark - uiscrollviewdelegate- (void)scrollviewdidscroll:(uiscrollview *)scrollview {}// 滚动结束时，将对应的视图控制器的视图添加到内容滚动视图中- (void)scrollviewdidenddecelerating:(uiscrollview *)scrollview { nsinteger i = self.contentscrollview.contentoffset.x / screenwidth; [self addviewtocontentscrollview:_buttons[i]]; // 内容滚动视图结束后选中对应的标题按钮 [self selectingbutton:_buttons[i]];}- (void)initchildviewcontrollers { // 0.头条 toplineviewcontroller * topviewcontroller = [[toplineviewcontroller alloc] init]; topviewcontroller.title = @"头条"; [self addchildviewcontroller:topviewcontroller]; // 1.科技 technologyviewcontroller * technologyviewcontroller = [[technologyviewcontroller alloc] init]; technologyviewcontroller.title = @"科技"; [self addchildviewcontroller:technologyviewcontroller]; // 2.汽车 carviewcontroller * carviewcontroller = [[carviewcontroller alloc] init]; carviewcontroller.title = @"汽车"; [self addchildviewcontroller:carviewcontroller]; // 3.体育 sportsviewcontroller * sportsviewcontroller = [[sportsviewcontroller alloc] init]; sportsviewcontroller.title = @"体育"; [self addchildviewcontroller:sportsviewcontroller]; // 4.视频 videoviewcontroller * videoviewcontroller = [[videoviewcontroller alloc] init]; videoviewcontroller.title = @"视频"; [self addchildviewcontroller:videoviewcontroller]; // 5.图片 imageviewcontroller * imageviewcontroller = [[imageviewcontroller alloc] init]; imageviewcontroller.title = @"图片"; [self addchildviewcontroller:imageviewcontroller]; // 6.热点 hotviewcontroller * hotviewcontroller = [[hotviewcontroller alloc] init]; hotviewcontroller.title = @"热点"; [self addchildviewcontroller:hotviewcontroller];}- (nsmutablearray *)buttons { if (_buttons == nil) { _buttons = [nsmutablearray array]; } return _buttons;}@end |
以上代码即可实现网易新闻 滚动的导航条， 因该功能可能在其它地方使用，所以最好可以将该功能抽出来，便于其它控制器集成，暂时还没做。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/vbirdbest/article/details/52449698
