Objective-c 枚舉訪問

對於數組、字典和集合，Objective-c提供了枚舉方法來訪問各個元素，具體方法有兩種：

方法1：

NSArray *array = ...;Member* member;int count = [array count];for(int i = 0 ; i < count ; i++) {  member= [array objectAtIndex:i];  NSLog([member description]);}

方法2:

for(Member* membre in array) {   NSLog([member description]);}

數組的例子：

  for( Student *stu4 in students ) {    NSLog(@"Name:%@,Age:%i", stu4.name, stu4.age);  }

集合例子:

for(NSNumber *interger in self) {    printf("%li",[interger intergerValue]);}

字典例子：

NSMutableDictionary *employes = [NSMutableDictionary dictionary];[employes setObject:@"張三" forKey:@"1"];  //增加一個鍵-值[employes setObject:@"李四" forKey:@"2"];  //增加一個鍵-值[employes setObject:@"王五" forKey:@"3"];  //增加一個鍵-值for(NSString *key in employes) {   NSLog(@"%@,%@",key,[employes objectForKey:key]);}