第十讲：Objective-C基本数据结构之NSArray
Dog.h#import <Foundation/Foundation.h>
@interface Dog:NSObject
@end;
Dog.m
#import "Dog.h"
@implementation Dog
- (NSString *)desctription
{
return @"This is a dog!";
}
@end
main.m
#import <Foundation/Foundation.h>
int main(int argc, const char * argv[])
{
@autoreleasepool{
Dog * dog = [ init];
NSArray * array = [ initWithObjects:@"One",@"Two",@"Three",dog,nil];
//数组元素可以是任意对象，数组中装的是元素的地址；
//返回每个元素的discription值(遍历打印)
NSLog(@"%@",array);//非连续的单词用双引号"This is a dog!"标识
NSLog(@"%@",dog);
//*************************************遍历方法之枚举器法
NSEnumerator * enumerator = ;
id obj;
while(obj = ){
NSLog(@"%@",obj);
}
//*************************************快速枚举法
for(id obj in array){
NSLog(@"%@",obj);
}
//*************************************使用i值遍历
NSUInteger length = ;
obj = ;
NSUinteger i;
for(i = 0,i < ,i++){
NSLog(@"%@",);
}
;
;
}
return 0;
}
三个非常实用的遍历方法：
1、枚举器法
2、快速枚举器法
3、i值遍历法
Xcode代码如下：
//
//main.m
//NSArray
//
//Created by yusian on 14-1-8.
//Copyright (c) 2014年 yusian. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "Dog.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
Dog * dog = [ init];
NSArray * array = [ initWithObjects:@"One",@"Two",@"Three",dog,nil];
NSLog(@"%@",array);
NSEnumerator * enumerator = ;
id obj;
while (obj = ) {
NSLog(@"%@",obj);
}//遍历法之枚举器法
for (id obj in array) {
NSLog(@"%@",obj);
}//遍历法之快速枚举法
NSUInteger length = ;
for (int i = 0; i <length; i++) {
NSLog(@"%@",);
}//i值遍历法
;
;
}
return 0;
}
Sian 发表于 2014-1-8 21:01
三个非常实用的遍历方法：
1、枚举器法
2、快速枚举器法
输出结果：
2014-01-08 20:59:44.789 NSArray (
One,
Two,
Three,
"This is a dog!"
)
2014-01-08 20:59:44.794 NSArray One
2014-01-08 20:59:44.795 NSArray Two
2014-01-08 20:59:44.795 NSArray Three
2014-01-08 20:59:44.795 NSArray This is a dog!
2014-01-08 20:59:44.796 NSArray One
2014-01-08 20:59:44.796 NSArray Two
2014-01-08 20:59:44.796 NSArray Three
2014-01-08 20:59:44.797 NSArray This is a dog!
2014-01-08 20:59:44.797 NSArray One
2014-01-08 20:59:44.797 NSArray Two
2014-01-08 20:59:44.798 NSArray Three
2014-01-08 20:59:44.798 NSArray This is a dog!
Program ended with exit code: 0
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