ios - NSMutableDictionary setObject :forKey (ios 6 without ARC) results in NULL
<p><p>以下代码在升级到 iOS 6 之前可以运行。它也可以在 5.1 iPhone 模拟器中运行，但在 6.0 模拟器和设备上会失败。</p>
<p>尝试在 NSMutableDictionary 的循环中设置对象:forKey。已尝试在循环中添加(如下面的代码所示)，并尝试使用对象和键的数组进行初始化，这会导致相同的失败。另一个奇怪的信息是，有时它有效，但大部分时间都失败了。添加的对象是 UILocalNotification，键是表示 WeekDay 的对象(不仅仅是一个简单的字符串)。运行的输出如下图所示。 UILocalNotifications 和键显然不是 NULL，但 MutableDictionary 中添加的对在大多数情况下对于某些对象具有 NULL。大多数情况下，它是最后添加的日期(键)，其对象为空。我完全不知道这是如何破坏的，在此先感谢您的帮助!</p>
<p>WeekDay 的复制方法(NSCopying 协议(protocol)):</p>
<pre><code>- (id)copyWithZone:(NSZone *)zone
{
WeekDay * copy = [ initWithDay:self.day];
return copy;
}
</code></pre>
<p>使用 setObject:forKey: 的代码片段</p>
<pre><code>NSMutableDictionary * newAlarmsDictionary = [ init];
NSArray * theDayKeys = [ sortedArrayUsingSelector:@selector(compare:)];
NSMutableArray * tempNotifyArray = [ init];
UILocalNotification * theAlarm = nil;
WeekDay * theWeekDay = nil;
for (int i=0; i < ; i++) {
if ([] boolValue] == TRUE) {
theWeekDay = ;
NSDate * now = ;
... deleted lines setting up fire date for UILocalNotification, not significant to problem ...
theAlarm = [ init];
theAlarm.fireDate = itemDate;
theAlarm.repeatInterval = NSWeekCalendarUnit;
theAlarm.timeZone = ;
theAlarm.soundName = UILocalNotificationDefaultSoundName;
theAlarm.applicationIconBadgeNumber = 0;
;
;
;
}
}
}
NSLog(@"--Debug: tempNotifyArray---- %@ -------------", tempNotifyArray);
NSLog(@"--Debug: newAlarmsDictionary ====== %@ =============", newAlarmsDictionary);
</code></pre>
<p>这是代码片段末尾的两个 NSlog 语句的输出。这个特殊的运行增加了 4 个通知，从周三到周六。放入 tempNotifyArray 的“警报”是有效的，但在添加到字典时(在本例中为一个)为空。</p>
<pre><code>2012-11-26 11:07:01.087 MedTrack --Debug: tempNotifyArray---- (
"<UIConcreteLocalNotification: 0x7277940>{fire date = Wednesday, November 28, 2012, 11:06:00 AM Eastern Standard Time, time zone = America/Toronto (EST) offset -18000, repeat interval = NSWeekCalendarUnit, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = Wednesday, November 28, 2012, 11:06:00 AM Eastern Standard Time, user info = {\n Temp = Fred;\n}}",
"<UIConcreteLocalNotification: 0x8883280>{fire date = Thursday, November 29, 2012, 11:06:00 AM Eastern Standard Time, time zone = America/Toronto (EST) offset -18000, repeat interval = NSWeekCalendarUnit, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = Thursday, November 29, 2012, 11:06:00 AM Eastern Standard Time, user info = {\n Temp = Fred;\n}}",
"<UIConcreteLocalNotification: 0x75c6590>{fire date = Friday, November 30, 2012, 11:06:00 AM Eastern Standard Time, time zone = America/Toronto (EST) offset -18000, repeat interval = NSWeekCalendarUnit, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = Friday, November 30, 2012, 11:06:00 AM Eastern Standard Time, user info = {\n Temp = Fred;\n}}",
"<UIConcreteLocalNotification: 0x75c83e0>{fire date = Saturday, December 1, 2012, 11:06:00 AM Eastern Standard Time, time zone = America/Toronto (EST) offset -18000, repeat interval = NSWeekCalendarUnit, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = Saturday, December 1, 2012, 11:06:00 AM Eastern Standard Time, user info = {\n Temp = Fred;\n}}"
</code></pre>
<p>) -------------</p>
<pre><code>2012-11-26 11:07:01.097 MedTrack --Debug: newAlarmsDictionary ====== {
" 6 (Sat)" = (null);
" 3 (Wed)" = "<UIConcreteLocalNotification: 0x7277940>{fire date = Wednesday, November 28, 2012, 11:06:00 AM Eastern Standard Time, time zone = America/Toronto (EST) offset -18000, repeat interval = NSWeekCalendarUnit, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = Wednesday, November 28, 2012, 11:06:00 AM Eastern Standard Time, user info = {\n Temp = Fred;\n}}";
" 4 (Thu)" = "<UIConcreteLocalNotification: 0x8883280>{fire date = Thursday, November 29, 2012, 11:06:00 AM Eastern Standard Time, time zone = America/Toronto (EST) offset -18000, repeat interval = NSWeekCalendarUnit, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = Thursday, November 29, 2012, 11:06:00 AM Eastern Standard Time, user info = {\n Temp = Fred;\n}}";
" 5 (Fri)" = "<UIConcreteLocalNotification: 0x75c6590>{fire date = Friday, November 30, 2012, 11:06:00 AM Eastern Standard Time, time zone = America/Toronto (EST) offset -18000, repeat interval = NSWeekCalendarUnit, repeat count = UILocalNotificationInfiniteRepeatCount, next fire date = Friday, November 30, 2012, 11:06:00 AM Eastern Standard Time, user info = {\n Temp = Fred;\n}}";
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>这里的问题是你实现了<code>-copyWithZone:</code>，但是你没有实现<code>-isEqual:</code>。在不了解对象的完整结构的情况下，我无法回答应该如何实现，但这里有一个很好的基础:</p>
<pre><code>- (BOOL)isEqual:(id)otherObject;
{
if (]) {
WeekDay *otherWeekDay= (WeekDay *)otherObject;
if (self.day != ) return NO;
if (self.name != ) return NO;
return YES;
}
return NO;
}
- (NSUInteger) hash;
{
return self.day ^ ;
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - NSMutableDictionary setObject :forKey (ios 6 without ARC) results in NULL，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/13568682/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/13568682/
</a>
</p>
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