IOS學習筆記十九NSArray和NSMutableArray

1、NSArray

NSArray不可變集合，不能添加新元素和删除已有元素和替換元素

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(@"正在處理第%ld個元素:%@", idx, obj);
        }];
    }
}      

3、結果

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] 正在處理第0個元素:chenyu
2018-07-15 21:17:44.454456+0800 cyTest[31047:9530812] 正在處理第1個元素:hello
2018-07-15 21:17:44.455253+0800 cyTest[31047:9530812] 正在處理第2個元素:word
2018-07-15 21:17:44.478747+0800 cyTest[31047:9530812] 正在處理第3個元素:god
2018-07-15 21:17:44.478861+0800 cyTest[31047:9530812] 正在處理第4個元素:chenzixuan      

4、NSMutableArray

nsMutableArray可變數組，代表是一個集合元素可變的集合

一般有add開頭、 remove開頭、replace開頭、sort開頭的方法

5、測試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、結果

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