Objective-C----快速枚舉、數組排序

標籤：objective   oc   快速枚舉   數組排序   

直接上代碼：

        /*         *  快速枚舉         *         */        NSLog( @"++++++++++++++++++" ) ;        NSArray *testArray = @[@1, @2, @3, @4, @5] ;        //通過快速枚舉來遍曆數組元素        for (NSArray *object in testArray) {            NSLog( @"%@", object ) ;        }        //不確定類型時用 id        for ( id object in testArray ) {            NSLog( @"%@", object ) ;        }        //快速遍曆集合        for ( id object in set1 ) {            NSLog( @"%@", object ) ;        }        //快速遍曆字典(得到的是字典的鍵)        //直接遍曆字典得到的是字典的每一個鍵，可以通過遍曆得到的鍵去擷取對應的值        for ( id object in dic1 ) {            NSLog( @"%@", object ) ;        }        //dic1[key]可得到對應value，這是一個文法糖，相當於[dic1 objectForKey:key]        for ( NSString *key in dic1) {            NSLog( @"dictionary[%@]:%@", key, dic1[key] ) ;        }        /*         *  數組排序         *         */        //注意初始化數組時，所有數組元素對象的類型相同，如下會出錯：@[@1, @2, @"5", @3, @4]        NSArray *array1 = @[@1, @2, @5, @3, @4] ;        //使用數組排序方法對數組進行升序排序        NSArray *resultArray = [array1 sortedArrayUsingSelector:@selector(compare:)] ;        NSLog( @"%@", resultArray ) ;        Student *stu1 = [Student studentWithName:@"wang" score:@85] ;        Student *stu2 = [Student studentWithName:@"zhen" score:@95] ;        Student *stu3 = [Student studentWithName:@"gang" score:@65] ;        NSMutableArray *stus = [NSMutableArray array] ;        [stus addObject:stu1] ;        [stus addObject:stu2] ;        [stus addObject:stu3] ;        [stus sortedArrayUsingSelector:@selector(scoreAscending:)] ;        NSLog( @"%@", stus ) ;        [stus sortedArrayUsingSelector:@selector(scoreDescending:)] ;        NSLog( @"%@", stus ) ;        [stus sortedArrayUsingSelector:@selector(nameAscending:)] ;        NSLog( @"%@", stus ) ;        [stus sortedArrayUsingSelector:@selector(nameDescending:)] ;        NSLog( @"%@", stus ) ;

Objective-C----快速枚舉、數組排序