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

標籤：

- (void)modernSyntax {/* 一、文法新特性NSNumber、NSArray、NSDictionary*/    // ---- NSNumber 新文法 ----    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);     //變數用新特性的時候用”()“包起來        //---- NSArray 新文法 ----    NSArray *array = nil;    //array = [NSArray arrayWithObjects:@1, @2, @3, nil];    array = @[@1, @2, @3];  // 初始化（靜態變數不能用新特性,舊方法也不行）//static NSArray *aa  = @[@1, @2];    id obj0 = array[0];      // 擷取子項目    // 遍曆方法1    NSUInteger count = array.count;    for (NSUInteger i=0; i<count; i++) {        NSLog(@"%@", array[i]);//    }    // 遍曆方法2    for (id obj in array) {        NSLog(@"%@", obj);    }    // 遍曆方法3    [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        if (*stop == NO) {            NSLog(@"|idx:%@-obj:%@|", @(idx), obj);        }    }];        //---- NSDictionary 新文法 ----    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"];// 擷取    //遍曆    [dic enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {        if (*stop == NO) {            NSLog(@"|key:%@-obj:%@|", key, obj);        }    }];    /* 二、synthesize*/    //寫了@property不用再寫@synthesize，Xcode自動合成}

 

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