NSDate * nowDate = [NSDate date];
NSLog(@"%@",nowDate);
// 距离现在3600*24秒的时间日期，单位秒
NSDate * tomorrow = [NSDate dateWithTimeIntervalSinceNow:3600*24];
NSLog(@"%@",tomorrow);
NSDate * date = [NSDate dateWithTimeIntervalSince1970:365*24*3600];
NSLog(@"%@",date);
// 计算两个日期之间的时间差，单位是秒
NSTimeInterval interval = [nowDate timeIntervalSinceDate:tomorrow];
NSLog(@"%f",interval);
NSTimeInterval interval2 = [nowDate timeIntervalSince1970];
NSLog(@"%f",interval2);
// 创建当前时间和一个固定时间
NSDate *now = [NSDate date];
NSDate *past = [NSDate dateWithTimeIntervalSinceNow:-50];
// 计算两个时间的时间差
NSTimeInterval interval3 =[now timeIntervalSinceDate:past];
if (interval3 <=60) {
NSLog(@"ganggang");
}
else if(interval3>60 && interval3<=3600){
NSLog(@"xxfenzhong");
}
else{
NSLog(@"xx");
}
// ============================================
// NSDateFormatter 日期和字符串之间的转化
NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
// 必须设置日期格式
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];// 也可@"yyyy年MM月dd日"
// 将日期转化成字符串,这样打印的时候才是自己位置时区的时间
NSDate * nowDate2 = [NSDate date];
NSString *str = [formatter stringFromDate:nowDate2];
NSLog(@"%@",str);
//将字符串转化成日期
NSDate * newDate = [formatter dateFromString:@"2000-1-1 10:12:23"];
NSLog(@"%@",newDate);
// 练习
NSDateFormatter *formatter5 = [[NSDateFormatter alloc] init];
// [formatter5 setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
[formatter5 setDateFormat:@"yyyy年MM月dd日 HH:mm:ss"];
NSDate * newDate4 = [formatter5 dateFromString:@"2014年05月01日 10:23:18"];
NSString * newDate5 = [formatter5 stringFromDate:newDate4];
NSLog(@"%@",newDate5);
// ===============================================================
// （分类）类目
/*
1.类目主要用于在不知道源码的情况下扩展类的功能；
2.类目只能为类添加方法，不能添加实例变量；
*/
// ===============================================================
// Extension:管理私有方法
//===============================================================
/*代理模式步骤：
1，定义协议 （BaoMuProtocol）
2，遵循协议的类 (Nurse)
3.定义需要代理的类 (Mother)
4.建立关系 (Mother中定义一个代理类型的成员变量)
*/
BaoMuProtocol:
@required
- (void)takeCareOfBaby;
@optional
- (void)cook;
- (void)doHouseWork;
@end
===================Nurse.h
#import "BaoMuProtocol.h"
@interface Nurse : NSObject<BaoMuProtocol>
@end
Nurse.m
- (void)takeCareOfBaby
{
NSLog(@"Nurse--takeCareOfBaby");
}
- (void)cook
{
NSLog(@"Nurse--cook");
}
- (void)doHouseWork
{
NSLog(@"Nurse--doHouseWork");
}
#import "BaoMuProtocol.h"
@interface Mother : NSObject
{
id<BaoMuProtocol> _delegate;
}
- (void)setDelegate:(id<BaoMuProtocol>)delegate;
- (id<BaoMuProtocol>)delegate;
- (void)work;
@end
(void)setDelegate:(id<BaoMuProtocol>)delegate
{
_delegate = delegate;
}
- (id<BaoMuProtocol>)delegate
{
return _delegate;
}
- (void)work
{
NSLog(@"Mother--Work");
[_delegate takeCareOfBaby];
}
Mother * mother = [[Mother alloc] init];
Nurse * nurse = [[Nurse alloc] init];
[mother setDelegate:nurse];
[mother work];
=============================