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
