Objective —C µÄµ¥Àýģʽ SingletonʵÏÖ
static
DataManager
*
sharedDataManager
=
nil;
+
(DataManager
*
) sharedManager
{
@synchronized(self)
{
if
(sharedDataManager
==
nil)
{
[[self alloc] init];
}
}
return
sharedDataManager;
}
+
(id)allocWithZone:(NSZone
*
)zone
{
@synchronized(self)
{
if
(sharedDataManager
==
nil)
{
sharedDataManager
=
[super allocWithZone:zone];
return
sharedDataManager;
}
}
return
nil;
}
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