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

 

 

 

main.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", @"hello", @"word", 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