NSArray和NSMutableArray的区别
[NSMutableArray arrayWithArray:@[@"结构上相对比较简单",@"用作cell平时的背景",@"如果没有实现该方法",@"然后需要实现三种类型的委托",@"+添加事情"]];
addObjectsFromArray
[[NSMutableArray alloc] init]; == [NSMutableArray new]; != [NSMutableArray array];
[_groupDefaults setObject:self.maData forKey:kShiQingValueKey];
The value
parameter can be only property list objects: NSData
, NSString
, NSNumber
, NSDate
, NSArray
, or NSDictionary
. For NSArray
and NSDictionary
objects, their contents must be property list objects