IOS 5.0 Object-c 新语法

1 NSArray a = @[ @”aaa” ,@”bbb” ,@”ccccc” ]

id obj2 = a[0]

NSDictionary b = @{@"a":@"a333" ,@"ddd":@"dddd" } 

id obj2 = dict[@"key1"]

NSNumber *number; number = @'X'; number = @12345; number = @12345ul; number = @12345ll; number = @123.45f; number = @123.45; number = @YES;

2 

property属性简化

property方便自动生成变量的getter 和setter。在.h文件中声明之后，不需要在.m文件中加上@synthesize关键字

3 typedef enum Week:NSUInteger{ Moday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday

    }Week;