iOS 语法新特性-modern syntax（iOS6后，Xcode4.4后，OS X 10.8.2后）

- (void)modernSyntax {
/* 一、语法新特性NSNumber、NSArray、NSDictionary*/
    // ---- NSNumber 新语法 ----
    NSNumber *num = nil;
    // num = [NSNumber numberWithInt:1];
    num = @1;       // numberWithInt/numberWithShort
    num = @1u;      // numberWithUnsignedInt/numberWithUnsignedShort
    num = @‘x‘;     // numberWithChar/numberWithUnsignedChar
    num = @1l;      // numberWithLong
    num = @1lu;     // numberWithUnsignedLong
    num = @1ll;     // numberWithLongLong
    num = @1llu;    // numberWithUnsignedLong
    num = @1.1f;    // numberWithFloat
    num = @1.234;   // numberWithDouble
    num = @YES;     // numberWithBool
    NSUInteger i = 1;
    num = @(i);     //变量用新特性的时候用”()“包起来
    
    //---- NSArray 新语法 ----
    NSArray *array = nil;
    //array = [NSArray arrayWithObjects:@1, @2, @3, nil];
    array = @[@1, @2, @3];  // 初始化（静态变量不能用新特性,旧方法也不行）//static NSArray *aa  = @[@1, @2];
    id obj0 = array[0];      // 获取子元素
    // 遍历方法1
    NSUInteger count = array.count;
    for (NSUInteger i=0; i<count; i++) {
        NSLog(@"%@", array[i]);//
    }
    // 遍历方法2
    for (id obj in array) {
        NSLog(@"%@", obj);
    }
    // 遍历方法3
    [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        if (*stop == NO) {
            NSLog(@"|idx:%@-obj:%@|", @(idx), obj);
        }
    }];
    
    //---- NSDictionary 新语法 ----
    NSDictionary *dic = nil;
    // dic = [NSDictionary dictionaryWithObjectsAndKeys:@0, @"key0", @1, @"key1", @2, @"key2", nil];
    dic = @{@"key0":@0, @"key1":@1, @"key2":@2};// 初始化方法
    id obj1 = dic[@"key0"];// 获取
    //遍历
    [dic enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        if (*stop == NO) {
            NSLog(@"|key:%@-obj:%@|", key, obj);
        }
    }];
    
/* 二、synthesize*/
    //写了@property不用再写@synthesize，Xcode自动合成
}