iOS时间轴的实现
时间轴的具体实现效果如图1所示：
图1
第一步：看到这个图，我们想到的第一反应就是使用tableView或者CollectionView来完成，那么我这里使用的是tableView。首先，创建一个Single View Application项目，在Main.Storyboard里面拖入一个TableView（如图2所示），这里别忘记了把TableView的delegate指向ViewController。
图 2
第二步：TableView完成了，接下来就是如何自定义TableViewCell了。在项目中new file选择Cocoa Touch Class，然后选择继承自TableViewCell，然后勾选XIB file选项，命名为“TimeCourseTableViewCell”，点击创建，完成后如图3所示：
图 3
接下来，就是为这个xib文件布局，通过图4圈出来的，我们可以找出一个cell里面具有什么控件。
图 4
根据这个，我们布局出来的如图5所示，主要就是Label和View来完成布局。
图 5
其实这里肯定会有人有疑问：
1.为什么下面那个不直接用一个Button就好了呢，还要用一个View里面嵌套一个Label呢？
2.为什么"内容"的那个label还要添加一个父控件View呢？
其实，刚开始的时候，我确实也是使用简单的一个Button和一个Label以为就可以了。后来发现，莫名的出现明明设置了buttom和label的Frame，修改了Origin，却总是出现乱七八糟的位置，后来通过view嵌套在里面，改变view的位置，就完全可以实现了。这个BUG本人也不清楚，望知情人告知，谢谢。
第三步：接下来，看xib里面的TimeCourseTableViewCell.h文件里的代码：
#import
@interface TimeCourseTableViewCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *lbDate; //日期
@property (weak, nonatomic) IBOutlet UILabel *lbTime; //时间
@property (weak, nonatomic) IBOutlet UIView *infoView; //白色底的那个View
@property (weak, nonatomic) IBOutlet UILabel *lbInfoTitle; //通知标题
@property (weak, nonatomic) IBOutlet UILabel *lbInfoContent; //通知内容
@property (weak, nonatomic) IBOutlet UIView *infoContentView; //通知内容的父View
@property (weak, nonatomic) IBOutlet UILabel *lbSegment; //竖着的灰色分割线
@property (weak, nonatomic) IBOutlet UIView *receiveView; //深红色的View
@property (weak, nonatomic) IBOutlet UILabel *lbReceive; //轻触收到通知
- (CGFloat)setCellHeight:(NSString *)strInfo isSameDay:(BOOL)isSame;
- (void)setRidues;
- (void)setClick;
- (void)setNotClick;
@end TimeCourseTableViewCell.m文件里的代码：
#import "TimeCourseTableViewCell.h"
@implementation TimeCourseTableViewCell
@synthesize lbDate;
@synthesize lbTime;
@synthesize infoView;
@synthesize lbInfoTitle;
@synthesize lbInfoContent;
@synthesize lbReceive;
@synthesize receiveView;
@synthesize lbSegment;
@synthesize infoContentView;
- (void)awakeFromNib {
// Initialization code
}
/*去掉上面的日期*/
- (void)deleteDate{
lbDate.hidden = YES;
CGRect timeTemp = lbTime.frame;
timeTemp.origin = CGPointMake(timeTemp.origin.x, 8);
lbTime.frame = timeTemp;
CGRect infoViewTemp = infoView.frame;
infoViewTemp.origin = CGPointMake(infoViewTemp.origin.x, 8);
infoView.frame = infoViewTemp;
}
/*设置显示的文本高度，以确定整个tableViewCell的高度，最后返回cell高度*/
- (CGFloat)setCellHeight:(NSString *)strInfo isSameDay:(BOOL)isSame{
/*如果是同一天 则去掉上面的日期*/
if (isSame) {
[self deleteDate];
}
[lbInfoContent setNumberOfLines:0]; //0行，则表示根据文本长度，自动增加行数
NSString *labelText = strInfo;
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:5.0f];//调整行间距
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
lbInfoContent.attributedText = attributedString;
[lbInfoContent sizeToFit]; //填充
//NSLog(@"%@",lbInfoContent);
CGRect infoContentViewTemp = infoContentView.frame;
infoContentViewTemp.size = CGSizeMake(212, lbInfoContent.frame.size.height);
infoContentView.frame = infoContentViewTemp;
/*设置手势点击位置*/
CGRect btnTemp = receiveView.frame;
btnTemp.origin = CGPointMake(0, infoContentView.frame.origin.y + infoContentView.frame.size.height + 8 );
receiveView.frame = btnTemp;
//NSLog(@"%@",receiveView);
/*设置整个infoView高度*/
CGRect viewTemp = infoView.frame;
viewTemp.size = CGSizeMake(viewTemp.size.width, receiveView.frame.origin.y + receiveView.frame.size.height);
infoView.frame = viewTemp;
//NSLog(@"%@",infoView);
lbSegment.frame = CGRectMake(lbSegment.frame.origin.x, 0, 3, infoView.frame.origin.y + infoView.frame.size.height + 8);
NSLog(@"HEight %f",infoView.frame.origin.y + infoView.frame.size.height + 8);
return infoView.frame.origin.y + infoView.frame.size.height + 8;
}
/*设置圆形*/
- (void)setRidues{
lbTime.layer.cornerRadius = lbTime.frame.size.width / 2;
[lbTime.layer setMasksToBounds:YES];
}
/*设置点击阅读样式*/
- (void)setClick{
CGFloat R = (CGFloat) 128/255.0;
CGFloat G = (CGFloat) 128/255.0;
CGFloat B = (CGFloat) 128/255.0;
CGFloat alpha = (CGFloat) 1.0;
UIColor *ColorRGB = [ UIColor colorWithRed: R
green: G
blue: B
alpha: alpha
];
receiveView.backgroundColor = ColorRGB;
lbReceive.text = @"我已收到通知";
}
/*设置未点击阅读样式*/
- (void)setNotClick{
CGFloat R = (CGFloat) 255/255.0;
CGFloat G = (CGFloat) 83/255.0;
CGFloat B = (CGFloat) 83/255.0;
CGFloat alpha = (CGFloat) 1.0;
UIColor *ColorRGB = [ UIColor colorWithRed: R
green: G
blue: B
alpha: alpha
];
receiveView.backgroundColor = ColorRGB;
lbReceive.text = @"轻触收到通知";
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
@end接下来，看ViewController.m文件里的代码：
#import "ViewController.h"
#import "TimeCourseTableViewCell.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITableView *messageTableView;
@property int messageSum; //cell个数
@property NSArray *infoArray; //保存信息内容
@property NSMutableArray *clickArray; //记录是否已经阅读了信息 1未接收 0接收
@end
@implementation ViewController
@synthesize messageSum;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
/*tableView*/
[self setTableViewStyle];
messageSum = 10;
self.infoArray = [[NSArray alloc] initWithObjects:@"老夫聊发少年狂，治肾亏，不含糖。",
@"锦帽貂裘，千骑用康王。",
@"",
@"为报倾城随太守，三百年，九芝堂。酒酣胸胆尚开张，西瓜霜，喜之郎。",
@"持节云中，三金葡萄糖。会挽雕弓如满月，西北望 ，阿迪王。",
@"十年生死两茫茫，恒源祥，羊羊羊。",
@"千里孤坟，洗衣用奇强。",
@"纵使相逢应不识，补维C，施尔康。",
@"夜来幽梦忽还乡，学外语，新东方。相顾无言，洗洗更健康。得年年断肠处，找工作，富士康",
@"啦啦啦",nil];
self.clickArray = [[NSMutableArray alloc] initWithObjects:@"1",
@"1",
@"1",
@"1",
@"1",
@"1",
@"1",
@"1",
@"1",
@"1",nil];
}
#pragma mark - 设置messageTableView的背景色和去掉分割线
- (void)setTableViewStyle{
self.messageTableView.separatorStyle = UITableViewCellSeparatorStyleNone; //去掉tabelView分割线
CGFloat R = (CGFloat) 237/255.0;
CGFloat G = (CGFloat) 237/255.0;
CGFloat B = (CGFloat) 237/255.0;
CGFloat alpha = (CGFloat) 1.0;
UIColor *ColorRGB = [ UIColor colorWithRed: R
green: G
blue: B
alpha: alpha
];
[self.messageTableView setBackgroundColor:ColorRGB];
}
#pragma mark - TabelView数据源协议
//该方法指定了表格视图的行数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return messageSum;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
//按时间分组，假设这里[0,2],[3,5],[6,9]是同一天
TimeCourseTableViewCell *nib = [[[NSBundle mainBundle] loadNibNamed:@"TimeCourseTableViewCell" owner:self options:nil] lastObject];
if ([indexPath row] == 0) {
NSLog(@"0");
return [nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:NO];
}
else if ([indexPath row]<3) {
NSLog(@"0 - 3");
return [nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:YES];
}else if ([indexPath row] == 3){
NSLog(@"3");
return [nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:NO];
}else if ([indexPath row] < 6){
NSLog(@"3 - 6");
NSLog(@"%f",[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:YES]);
return [nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:YES];
}else if ([indexPath row] == 6){
NSLog(@"6");
NSLog(@"%f",[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:NO]);
return [nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:NO];
}else if ([indexPath row] > 6){
NSLog(@"6- 9");
NSLog(@"%f",[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:YES]);
return [nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:YES];
}else
return 145;
}
//该方法返回单元格对象，有多少行表格，则调用多少次
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *simpleIdentify = @"TimeCourse";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleIdentify];
TimeCourseTableViewCell *nib = [[[NSBundle mainBundle] loadNibNamed:@"TimeCourseTableViewCell" owner:self options:nil] lastObject];
[nib setTag:[indexPath row]];
if ([[self.clickArray objectAtIndex:[indexPath row]] isEqualToString:@"1"]) {
[nib setNotClick];
}else
[nib setClick];
[nib setRidues];
UITapGestureRecognizer *Tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)];
nib.receiveView.userInteractionEnabled = YES;
[nib.receiveView addGestureRecognizer:Tap];
if ([indexPath row] == 0) {
[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:NO];
}
else if ([indexPath row]<3) {
[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:YES];
}else if ([indexPath row] == 3){
[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:NO];
}else if ([indexPath row] < 6){
[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:YES];
}else if ([indexPath row] == 6){
[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:NO];
}else if ([indexPath row] > 6){
[nib setCellHeight:[self.infoArray objectAtIndex:[indexPath row]] isSameDay:YES];
}
cell = nib;
cell.selectionStyle = UITableViewCellSelectionStyleNone; //去掉提供的选中无颜色
return cell;
}
#pragma mark - TabelView代理协议
//选中事件
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"44");
}
- (void)tapGesture:(UITapGestureRecognizer *)sender{
NSLog(@"接收通知");
UIView *view = sender.self.view;
TimeCourseTableViewCell *cell = (TimeCourseTableViewCell *)view.superview.superview.superview;
UILabel *lb = view.subviews[0];
NSString *str = @"轻触收到通知";
if ([lb.text isEqualToString:str]) {
[cell setClick];
[self.clickArray setObject:@"0" atIndexedSubscript:cell.tag];
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end那么，运行之后，效果如图6所示：
图 6