如何比较目标C中的两个NSDate对象 [英] How to compare two NSDate objects in objective C

问题描述

我有Date类型的对象。

所以我想比较他们，我写了一个if条件下面的方式

  if（（[startDate1 isEqualToDate：[self getDefaultDate]]）||（startDate1！= [self getDefaultDate]&& m_selectedDate> = m_currentDate1&& cycleStopped））
 {
 
 ///执行某些条件
 
} 
   
 
 
还有一件事，无论是否这种方式是正确的
  if（dtdate> [m_array objectatIndex：i] 
 {
 
 } 
  
因为我得到了一个随机行为.. 
 
 $ b b 
请帮助我的朋友和极客。
 
 
 
尊重
 Ranjit 
方案
下面是使用 NSDate 方法， compare： 
  if（[startDate compare：endDate] == NSOrderedDescending）//如果开始时间晚于结束
 {
 / / do something 
} 
  
从类引用：
 
 
如果... 
 
 
 
接收者和anotherDate完全相同，
 NSOrderedSame。 
 
 
 
接收者的时间晚于另一个日期NSOrderedDescending。
 
 
 
接收者的时间早于anotherDate， NSOrderedAscending。
 
 
您也可以使用 timeIntervalSinceDate：比较两个日期并找出它们之间的秒数。
 
 
 
编辑：
  if（（[startDate1 compare：[self getDefaultDate]] == NSOrderedSame）|| （[startDate1 compare：[self getDefaultDate]]！= NSOrderedSame&（（[m_selectedDate compare：m_currentDate1] == NSOrderedDescending）|| [m_selectedDate compare：m_currentDate1] == NSOrderedSame）&& cycleStopped））
  
 
I have objects of Date type..

So I want to compare them, and I have written a if condition in the following below way
if(([startDate1 isEqualToDate:[self getDefaultDate]]) || (startDate1 != [ self getDefaultDate] && m_selectedDate >= m_currentDate1 && cycleStopped))
 {

///execute some condition

}
So whether I am right or wrong..in this approach?

One more thing  whether righting this way is right
if(dtdate > [m_array objectatIndex:i]
{

}
Because I am getting a random behaviour..

So please help me out friends and geeks

Regards
Ranjit
解决方案
Here's an example using the NSDate method, compare:
if([startDate compare: endDate] == NSOrderedDescending) // if start is later in time than end
{
    // do something
}
From the class reference:

  
If...
  
  
The receiver and anotherDate are exactly equal to each other,
  NSOrderedSame.
  
  
The receiver is later in time than anotherDate, NSOrderedDescending.
  
  
The receiver is earlier in time than anotherDate, NSOrderedAscending.
You could also use the timeIntervalSinceDate: method if you wanted to compare two dates and find the seconds between them, for example.

EDIT:
if(([startDate1 compare:[self getDefaultDate]] == NSOrderedSame) || ([startDate1 compare: [self getDefaultDate]] != NSOrderedSame && (([m_selectedDate compare: m_currentDate1] == NSOrderedDescending) || [m_selectedDate compare: m_currentDate1] == NSOrderedSame) && cycleStopped))


                        
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