轻松实现标签视图切换效果
一、先上效果图,看了自然就明白二、设计思路
1、如何实现类似功能或效果呢,首先顶部标签切换效果在前面已有专门的贴子做了详细说明,参考http://www.yusian.com/bbs/thread-8961-1-1.html
2、下面视图切换的基本思路是根据上面标签的数目创建对应多个View,放到ScrollView上面,通过pageingEnable属性分屏切换
3、通过ScrollView的代理方法,监听当前ScrollView的滚动状态与上面标签栏联动
4、同样,上面标签栏点击事件动态改变ScrollView的contentOffset,使得下面视图与标签保持对应一致
三、使用说明
1、该控件包含三个类:SASwitchBar、SASwitchView、SASwitchCtrl,分别为标签栏、视图、控制器,前两个类为视图负责展示并监听事件,最后一个类负责事件处理与视图控制;
2、使用时只需要新建一个控制器并继承自SASwitchCtrl即可,然后设置SASwitchBar的items数组,再设置SASwitchView的视图数组,搞定!
3、示例:
// 设置标签选项卡
self.switchBar.items = @[@"蓝", @"橙", @"红"];
// 创建三个切换演示视图
UIView *blue = [ init];
blue.backgroundColor = ;
UIView *orange = [ init];
orange.backgroundColor = ;
UIView *red = [ init];
red.backgroundColor = ;
// 添加演示视图
self.switchView.views = @;
四、关键代码
1、SASwitchView.h
#import <UIKit/UIKit.h>
@interface SASwitchView : UIScrollView
@property (nonatomic, strong)NSArray*views;
@end2、SASwitchView.m
#import "SASwitchView.h"
@implementation SASwitchView
- (void)setViews:(NSArray *)views
{
_views = views;
CGFloat width = [ bounds].size.width;
// 在视图数组赋值时,同时整理各视图的布局,主要是x/y坐标,此时还不能确定视图大小
for (int i = 0; i < self.views.count; i++){
UIView *view = self.views;
view.frame = (CGRect){width * i, 0, width, 0};
;
}
self.contentSize = (CGSize){width * views.count, 0};
}
- (void)setFrame:(CGRect)frame
{
;
// 外部给视图设置大小时,同时调整内部子视图,保持子视图与父控制大小一致
for (UIView *view in self.subviews) {
CGRect rect = view.frame;
rect.size.height = frame.size.height;
view.frame = rect;
}
}
@end3、SASwitchCtrl.h
#import <UIKit/UIKit.h>
#import "SASwitchBar.h"
#import "SASwitchView.h"
@interface SASwitchCtrl : UIViewController
@property (strong, nonatomic)SASwitchBar *switchBar;
@property (strong, nonatomic)SASwitchView *switchView;
@end4、SASwitchCtrl.m
#define kSASwitchBarH 44
#import "SASwitchCtrl.h"
@interface SASwitchCtrl () <SASwitchBarDelegate, UIScrollViewDelegate>
@end
@implementation SASwitchCtrl
#pragma mark - 初始化方法
- (instancetype)init
{
if (self = ) {
self.switchBar = [ init];
self.switchView = [ init];
self.switchView.autoresizingMask = UIViewAutoresizingFlexibleBottomMargin;
;
;
}
return self;
}
- (void)viewDidLoad
{
;
self.edgesForExtendedLayout = UIRectEdgeNone;
self.switchView.showsHorizontalScrollIndicator = NO;
self.switchView.pagingEnabled = YES;
self.switchBar.delegate = self;
self.switchView.delegate = self;
}
- (void)viewWillAppear:(BOOL)animated
{
;
{
CGFloat w = self.view.frame.size.width;
CGFloat h = self.view.frame.size.height - kSASwitchBarH;
self.switchBar.frame = (CGRect){0, 0, w, kSASwitchBarH};
self.switchView.frame = (CGRect){0, kSASwitchBarH, w, h};
}
}
#pragma mark - 代理方法
// 上部标签栏事件处理
- (void)switchBar:(SASwitchBar *)switchBar seletedIndex:(NSInteger)index
{
// 标签点击第几个,scrollView的offset即跳转到第几屏,并以动画形式转场
CGPoint offset = (CGPoint){self.view.frame.size.width * index, 0};
[UIView animateWithDuration:0.3 animations:^{
self.switchView.contentOffset = offset;
}];
}
// scrollView代理方法
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
int page = scrollView.contentOffset.x / self.view.frame.size.width;
self.switchBar.selectedIndex = page;
}
@end
五、Demo下载:**** Hidden Message ***** 太实用了,真心非常感谢 . 下来看看了
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