IOS学习笔记十九NSArray和NSMutableArray

发布时间：2023-03-27 11:17:29 所属栏目：教程来源：

导读：NSArrayNSArray不可变集合，不能添加新元素和删除已有元素和替换元素2、demoDog.h#import &lt;Foundation/Foundation.h&gt;#ifndef Dog_h#define Dog_h@interface Dog : NSObject@property (nonatomic, stro

NSArrayNSArray不可变集合，不能添加新元素和删除已有元素和替换元素2、demoDog.h#import &lt;Foundation/Foundation.h&gt;#ifndef Dog_h#define Dog_h@interface Dog : NSObject@property (nonatomic, strong) NSStr...

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1、NSArray
NSArray不可变集合，不能添加新元素和删除已有元素和替换元素

2、demo
Dog.h

#import <Foundation/Foundation.h>
#ifndef Dog_h
#define Dog_h
@interface Dog : NSObject
@property (nonatomic,strong) Nsstring *name;
@property (nonatomic,assign) int age;
-(id)initWithName:(Nsstring *)name age:(int)age;
-(void)say:(Nsstring *)content;
@end
#endif /* Dog_h */

Dog.m

#import <Foundation/Foundation.h>
#import "Dog.h"
@implementation Dog
@synthesize name;
@synthesize age;
-(id)initWithName:(Nsstring *)name age:(int)age
{
if (self = [super init])
{
self.name = name;
self.age = age;
}
return self;
}
-(void)say:(Nsstring *)content
{
NSLog(@"%@ say %@",name,content);
}
-(BOOL)isEqual:(id)object
{
if (object == self)
return YES;
if ([object class] == Dog.class)
{
Dog *dog = (Dog *)object;
return [self.name isEqualToString:dog.name] && (self.age == dog.age);
}
return NO;
}
@end
ain.m

int main(int argc,char * argv[]) {
@autoreleasepool {
NSArray *array = [NSArray arrayWithObjects:@"chenyu",@"hello",@"word",@"god",nil];
NSLog(@"first data id %@",[array objectAtIndex:0]);
NSLog(@"first data id %@",[array objectAtIndex:1]);
NSLog(@"first data id %@",[array lastObject]);

NSLog(@"@hello is %ld",[array indexOfObject:@"hello"]);

array = [array arrayByAddingObject:@"chenzixuan"];

for (int i = 0; i < array.count; ++i)
{
NSLog(@"%@",[array objectAtIndex:i]);
}

NSArray *arr = [NSArray arrayWithObjects:[[Dog alloc] initWithName:@"chen" age:1],[[Dog alloc] initWithName:@"chenyu" age:1],[[Dog alloc] initWithName:@"chengongyu" age:1],nil];


Dog *d = [[Dog alloc] initWithName:@"chenyu" age:1];
NSInteger pos = [arr indexOfObject:d];
NSLog(@"index is %ld",pos);

[arr makeObjectsPerformSelector:@selector(say:) withObject:@"拜拜"];

Nsstring *str = @"hello";

[array enumerateObjectsUsingBlock:^(id _Nonnull obj,NSUInteger idx,BOOL * _Nonnull stop) {
NSLog(@"正在处理第%ld个元素:%@",idx,obj);
}];
}
}

3、结果
2018-07-15 21:17:44.447732+0800 cyTest[31047:9530812] first data id chenyu
2018-07-15 21:17:44.449642+0800 cyTest[31047:9530812] first data id hello
2018-07-15 21:17:44.450020+0800 cyTest[31047:9530812] first data id god
2018-07-15 21:17:44.450943+0800 cyTest[31047:9530812] @hello is 1
2018-07-15 21:17:44.451207+0800 cyTest[31047:9530812] chenyu
2018-07-15 21:17:44.451493+0800 cyTest[31047:9530812] hello
2018-07-15 21:17:44.451739+0800 cyTest[31047:9530812] word
2018-07-15 21:17:44.451986+0800 cyTest[31047:9530812] god
2018-07-15 21:17:44.452233+0800 cyTest[31047:9530812] chenzixuan
2018-07-15 21:17:44.453020+0800 cyTest[31047:9530812] index is 1
2018-07-15 21:17:44.453332+0800 cyTest[31047:9530812] chen say 拜拜
2018-07-15 21:17:44.453581+0800 cyTest[31047:9530812] chenyu say 拜拜
2018-07-15 21:17:44.453803+0800 cyTest[31047:9530812] chengongyu say 拜拜
2018-07-15 21:17:44.454188+0800 cyTest[31047:9530812] 正在处理第0个元素:chenyu
2018-07-15 21:17:44.454456+0800 cyTest[31047:9530812] 正在处理第1个元素:hello
2018-07-15 21:17:44.455253+0800 cyTest[31047:9530812] 正在处理第2个元素:word
2018-07-15 21:17:44.478747+0800 cyTest[31047:9530812] 正在处理第3个元素:god
2018-07-15 21:17:44.478861+0800 cyTest[31047:9530812] 正在处理第4个元素:chenzixuan

4、NSMutableArray
nsMutableArray可变数组，代表是一个集合元素可变的集合

一般有add开头、 remove开头、replace开头、sort开头的方法

5、测试Demo
NSMutableArray *muArray = [NSMutableArray arrayWithObjects:@"chen",@"yu",nil];
[muArray addobject:@"123"];
[muArray removeObject:@"yu"];
[muArray replaceObjectAtIndex:1 withObject:@"xx"];
for (id ob in muArray) {
NSLog(@"ob is %@",ob);
}

6、结果
2018-07-18 22:02:57.498997+0800 cyTest[31429:12701122] ob is chen
2018-07-18 22:02:57.600036+0800 cyTest[31429:12701122] ob is xx
2018-07-18 22:02:57.600599+0800 cyTest[31429:12701122] ob is word
2018-07-18 22:02:57.600824+0800 cyTest[31429:12701122] ob is 123

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