BSBuDeJie_04

时间:2022-02-09 00:03:56

一 段子的下拉

   建立模型

    数字类型的用assign

/* 当前页码 */
@property (nonatomic, assign) NSInteger page;

二 下拉上拉细节处理

 

三 细节处理

  1 在各种网络之下,page的数值也不同

    

  2 定义全局常量

    .h文件放引用

    .m文件放定义

    command + b 编译一下

#import <UIKit/UIKit.h>

UIKIT_EXTERN CGFloat const BSTitlesViewH;
UIKIT_EXTERN CGFloat const BSTitlesViewY;
#import <UIKit/UIKit.h>

CGFloat const BSTitlesViewH = ;
CGFloat const BSTitlesViewY = ;
    titlesView.height = BSTitlesViewH;
titlesView.y = BSTitlesViewY;

  3 可以在numberOfRowsInSection中判断刷新控件的初始状态(是否被隐藏)

   self.tableView.mj_footer.hidden = self.topics.count == ;

四 cell的基本结构

  1 取消分割线

    //取消分割线
self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
self.tableView.backgroundColor = [UIColor clearColor];  

  2 设置图片不要拉伸

  BSBuDeJie_04

  3 重写cell的间距

- (void)setFrame:(CGRect)frame
{
static CGFloat margin = ; frame.origin.x = margin;
frame.size.width -= * frame.origin.x;
frame.size.height -= margin;
frame.origin.y += margin; [super setFrame:frame];
}

  4 在cell中使用Model

@class BSTopic;

@interface BSTopicCell : UITableViewCell

/* 模型数据 */
@property (nonatomic, strong) BSTopic *topic; @end
- (void)setTopic:(BSTopic *)topic
{
_topic = topic;
}
   cell.topic = self.topics[indexPath.row];

  5 设置cell的背景图片 

- (void)awakeFromNib
{
UIImageView *imageView = [[UIImageView alloc] init];
imageView.image = [UIImage imageNamed:@"mainCellBackground"];
self.backgroundView = imageView;
}

  6 利用代理方法设置cell的高度

# pragma mark - 代理方法
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{ return ;
}

  BSBuDeJie_04

五  cell的基本数据

  处理按钮的文字

- (void)setupButtonTitle:(UIButton *)button count:(NSInteger)count placeholder:(NSString *)placeholder
{ if (count == ) {
placeholder = placeholder;
}else if (count > ) {
placeholder = [NSString stringWithFormat:@"%.1f万", count / 10000.0];
}else{
placeholder = [NSString stringWithFormat:@"%zd", count];
} [button setTitle:placeholder forState:UIControlStateNormal];
}

  BSBuDeJie_04

  1 处理时间数据

    用服务器返回的时间与当前时间对比

    //当前时间
NSDate *now = [NSDate date];
//发帖时间 NSString -> NSDate
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
//设置日期格式(y:年 M:月 d:天 H:小时 m:分钟 s:秒)
fmt.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSDate *create = [fmt dateFromString:topic.create_time]; NSTimeInterval delta = [create timeIntervalSinceDate:now]; NSLog(@"%f",delta);

    BSBuDeJie_04

  2 NSCalendar日历类

    2.1 利用NSCalendar来获取NSDate的每一个元素

//当前时间
NSDate *now = [NSDate date]; //日历
NSCalendar *calendar = [NSCalendar currentCalendar]; NSInteger year = [calendar component:NSCalendarUnitYear fromDate:now];
   NSInteger month = [calendar component:NSCalendarUnitMonth fromDate:now];
   NSInteger day = [calendar component:NSCalendarUnitDay fromDate:now];
   BSLog(@"%zd",year);

   BSBuDeJie_04

     2.2

    //当前时间
NSDate *now = [NSDate date]; //日历
NSCalendar *calendar = [NSCalendar currentCalendar]; NSDateComponents *cmps = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:now]; BSLog(@"%zd %zd %zd ", cmps.year, cmps.month, cmps.day);

  BSBuDeJie_04

  3 比较时间

    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
//设置日期格式(y:年 M:月 d:天 H:小时 m:分钟 s:秒)
fmt.dateFormat = @"yyyy-MM-dd HH:mm:ss"; //当前时间
NSDate *now = [NSDate date]; NSDate *create = [fmt dateFromString:create_time]; //日历
NSCalendar *calendar = [NSCalendar currentCalendar]; //比较时间
NSCalendarUnit unit = NSCalendarUnitYear |NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
NSDateComponents *cmps = [calendar components:unit fromDate:create toDate:now options:]; BSLog(@"%@ %@", now, create);
BSLog(@"%zd %zd %zd %zd %zd %zd", cmps.year, cmps.month, cmps.day, cmps.hour, cmps.minute, cmps.second);

  BSBuDeJie_04

  +0000东八区

  4 封装到扩展类中

#import <Foundation/Foundation.h>

@interface NSDate (BSExtension)

//比较from和self的时间差值
- (NSDateComponents *)deltaFrom:(NSDate *)from; @end
#import "NSDate+BSExtension.h"

@implementation NSDate (BSExtension)

- (NSDateComponents *)deltaFrom:(NSDate *)from
{
//日历
NSCalendar *calendar = [NSCalendar currentCalendar]; //比较时间
NSCalendarUnit unit = NSCalendarUnitYear |NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
return [calendar components:unit fromDate:from toDate:self options:]; } @end

  BSBuDeJie_04

七 日期处理

@interface NSDate (BSExtension)

//比较from和self的时间差值
- (NSDateComponents *)deltaFrom:(NSDate *)from; //是否为今年
- (BOOL)isThisYear;
//是否为今天
- (BOOL)isToday;
//是否为昨天
- (BOOL)isYesteday; @end
- (BOOL)isThisYear
{
//日历
NSCalendar *calendar = [NSCalendar currentCalendar]; NSInteger nowYear = [calendar component:NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger selfYear = [calendar component:NSCalendarUnitYear fromDate:self]; return nowYear == selfYear;
} //- (BOOL)isToday
//{
// //日历
// NSCalendar *calendar = [NSCalendar currentCalendar];
//
// NSCalendarUnit unit = NSCalendarUnitYear |NSCalendarUnitMonth | NSCalendarUnitDay;
// NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];
// NSDateComponents *selfCmps = [calendar components:unit fromDate:self];
//
// return nowCmps.year == selfCmps.year && nowCmps.month == selfCmps.month && nowCmps.day == selfCmps.day;
//} - (BOOL)isToday
{
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd"; NSString *nowString = [fmt stringFromDate:[NSDate date]];
NSString *selfString = [fmt stringFromDate:self]; return [nowString isEqualToString:selfString];
} - (BOOL)isYesteday
{
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
fmt.dateFormat = @"yyyy-MM-dd"; NSDate *nowDate = [fmt dateFromString:[fmt stringFromDate:[NSDate date]]];
NSDate *selfDate = [fmt dateFromString:[fmt stringFromDate:self]]; //日历
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *cmps = [calendar components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:selfDate toDate:nowDate options:]; return cmps.year == && cmps.month == && cmps.day == ; }

  测试:

八  日期的精确显示

  利用刚才的事件处理方法获得精确的不同的时间处理数据,并显示在cell中

/*
今年
今天
1分钟内
刚刚
1小时内
xx分钟前
其他
xx小时前
昨天
昨天 12:00:00
其他
10-10 12:00:00
非今年
2016-10-10 12:22:22
*/
- (NSString *)create_time{

    //日期格式化
NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
//设置日期格式(y:年 M:月 d:天 H:小时 m:分钟 s:秒)
fmt.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSDate *create = [fmt dateFromString:_create_time]; if (create.isThisYear) {//今年
if (create.isToday) {//今天
NSDateComponents *cmps = [[NSDate date] deltaFrom:create];
if (cmps.hour >= ) {//时间差距 >= 1小时
return [NSString stringWithFormat:@"%zd小时前", cmps.hour];
}else if(cmps.minute >= ){//1小时 > 时间差距 >= 1分钟
return [NSString stringWithFormat:@"%zd分钟前", cmps.minute];
}else{//时间差距 < 1分钟
return @"刚刚";
}
}else if (create.isYesteday){//昨天
fmt.dateFormat = @"昨天 HH:mm:ss";
return [fmt stringFromDate:create];
}else{//其他
fmt.dateFormat = @"MM-dd HH:mm:ss";
return [fmt stringFromDate:create];
}
}else{//非今年
return _create_time;
} }

BSBuDeJie_04

九 新浪加V

  1 随机生成二进制数字

    //随机生成的二进制数字
topic.sina_v = arc4random_uniform() % ;

  2 控制视图是否隐藏(根据服务器返回的值)

    //新浪加V
self.sinaVView.hidden = !topic.isSina_v;

  3 把服务器返回的int转成bool类型

/* 是否是新浪加V用户 */
@property (nonatomic, assign, getter=isSina_v) BOOL sina_v;

  BSBuDeJie_04BSBuDeJie_04

十 子控制器重构(变量在父类中的处理)

  1 可以在父类中声明一个方法,然后在子类中实现

/* 帖子类型(交给子类去实现) */
- (NSString *)type;
- (NSString *)type
{
return @"";
}

  2 将变量作为父类中的一个属性,在调用时直接传入参数

/* 帖子类型 */
@property(nonatomic, copy)NSString *type;
    BSTopicViewController *word = [[BSTopicViewController alloc] init];
word.title = @"段子";
word.type = @"";
[self addChildViewController:word];

  3 将变量类型写成枚举

typedef enum
{
BSTopicTypeAll = ,
BSTopicTypePicture = ,
BSTopicTypeWord = ,
BSTopicTypeVoice = ,
BSTopicTypeVideo = } BSTopicType;
/* 帖子类型 */
@property(nonatomic, assign) BSTopicType type;
    BSTopicViewController *word = [[BSTopicViewController alloc] init];
word.title = @"段子";
word.type = BSTopicTypeWord;
[self addChildViewController:word];

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