objective-c - 将 NSDate 的 NSArray 转换为格式化日期字符串数组

Question

我有一个 NSDate 格式的 NSArray 中的非连续日期数组。我需要数组中的相同日期集，但格式为 dd/MM 的 NSString。我想我需要循环读取原始数组中的每个日期，将其转换为字符串并根据需要对其进行格式化，但我不知道如何逐步遍历原始数组。

NSError *error2;
NSArray *swim750mArray = [context executeFetchRequest:request2 error:&error2];
if (swim750mArray == nil) {
    NSLog(@"The fetch request2 returned an array == nil");
} else {
    NSLog(@"The fetch request2 returned an array...");
    NSLog(@"%@", swim750mArray);

NSArray *datesAsDates = [swim750mArray valueForKey:@"date"];
NSMutableArray* arrayOfDatesAsStrings = [NSMutableArray arrayWithCapacity:count];

    //SomeCode - Convert the Array of NSDates to a new Array of dates as NSStrings...

      for (int i=0; i<index; i++) {
           //get the date next NSDate from the array as: NSDate *dateAsDate...
           NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
           [dateFormat setDateFormat:@"dd/MM"];


         NSString *dateAsStr = [dateFormat stringFromDate:dateAsDate];

         [arrayOfDatesAsStrings addObject:dateAsStr];
        }

这个答案接近我需要的，只是它不从现有数组中读取:How to use NSDate formatter with an array of dates?

请帮忙!预先非常感谢...

Answer 1

使用 fast enumeration 怎么样？ ？

for (NSDate* dateAsDate in datesAsDates) {
     //get the date next NSDate from the array as: NSDate *dateAsDate...
     NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
     [dateFormat setDateFormat:@"dd/MM"];

     NSString *dateAsStr = [dateFormat stringFromDate:dateAsDate];

     [arrayOfDatesAsStrings addObject:dateAsStr];
}