ios - 将 NSDate 与 [NSMutableArray objectatIndex :i]

Question

我有一个名为..的函数

-(BOOL)isDateOkForHistory:(NSDate *)dtHist
{
    bool dateOkForHistory = false;

    for(NSInteger i=0;i<m_histCount;i++)
    {
           if(dtHist > [m_dtHistory objectAtIndex:i])
           {       
               //execute some condition.....
           }
     }
}

这里 m_dtHistory 是一个 NSMutableArray.......所以我怀疑我正在检查的 if 语句是否正确..？

问候兰 git

Answer 1

NSDate 对象应该使用 compare: 方法进行比较。
示例:

if ([dtHist compare:[m_dtHistory objectAtIndex:i]] == NSOrderedDescending) {

}

文档:http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/Reference/Reference.html