逆序打印一个字符串方法

//定义一个字符串
NSString *str = @"My name is Summer i love";
//使用空格分隔上述字符串
NSArray *array1 = [str componentsSeparatedByString:@" "
];
//定义一个可变的数组
NSMutableArray *array2 = [[NSMutableArray alloc] init];
//倒序打印
NSEnumerator *enumerator = [array1 reverseObjectEnumerator];
//把单词遍历到可变的数组中
NSString *obj;
while (obj = [enumerator nextObject]) {
[array2 addObject:obj];
}
NSLog(@"%@", array2);
//使用空格进行字符串拼接
NSString *newStr = [array2 componentsJoinedByString:@" "];
NSLog(@"%@", newStr);