IOS学习笔记十九NSArray和NSMutableArray
【摘要】 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 (non...
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
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#import <Foundation/Foundation.h>
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#ifndef Dog_h
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#define Dog_h
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@interface Dog : NSObject
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@property (nonatomic, strong) NSString *name;
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@property (nonatomic, assign) int age;
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-(id)initWithName:(NSString *)name age:(int)age;
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-(void)say:(NSString *)content;
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@end
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#endif /* Dog_h */
Dog.m
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#import <Foundation/Foundation.h>
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#import "Dog.h"
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@implementation Dog
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@synthesize name;
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@synthesize age;
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-(id)initWithName:(NSString *)name age:(int)age
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{
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if (self = [super init])
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{
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self.name = name;
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self.age = age;
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}
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return self;
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}
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-(void)say:(NSString *)content
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{
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NSLog(@"%@ say %@", name, content);
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}
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-(BOOL)isEqual:(id)object
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{
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if (object == self)
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return YES;
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if ([object class] == Dog.class)
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{
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Dog *dog = (Dog *)object;
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return [self.name isEqualToString:dog.name] && (self.age == dog.age);
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}
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return NO;
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}
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@end
main.m
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int main(int argc, char * argv[]) {
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@autoreleasepool {
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NSArray *array = [NSArray arrayWithObjects:@"chenyu", @"hello", @"word", @"god", nil];
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NSLog(@"first data id %@", [array objectAtIndex:0]);
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NSLog(@"first data id %@", [array objectAtIndex:1]);
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NSLog(@"first data id %@", [array lastObject]);
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NSLog(@"@hello is %ld", [array indexOfObject:@"hello"]);
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array = [array arrayByAddingObject:@"chenzixuan"];
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for (int i = 0; i < array.count; ++i)
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{
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NSLog(@"%@", [array objectAtIndex:i]);
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}
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NSArray *arr = [NSArray arrayWithObjects:[[Dog alloc] initWithName:@"chen" age:1], [[Dog alloc] initWithName:@"chenyu" age:1], [[Dog alloc] initWithName:@"chengongyu" age:1], nil];
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Dog *d = [[Dog alloc] initWithName:@"chenyu" age:1];
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NSInteger pos = [arr indexOfObject:d];
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NSLog(@"index is %ld", pos);
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[arr makeObjectsPerformSelector:@selector(say:) withObject:@"拜拜"];
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NSString *str = @"hello";
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[array enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
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NSLog(@"正在处理第%ld个元素:%@", idx, obj);
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}];
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}
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}
3、结果
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2018-07-15 21:17:44.447732+0800 cyTest[31047:9530812] first data id chenyu
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2018-07-15 21:17:44.449642+0800 cyTest[31047:9530812] first data id hello
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2018-07-15 21:17:44.450020+0800 cyTest[31047:9530812] first data id god
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2018-07-15 21:17:44.450943+0800 cyTest[31047:9530812] @hello is 1
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2018-07-15 21:17:44.451207+0800 cyTest[31047:9530812] chenyu
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2018-07-15 21:17:44.451493+0800 cyTest[31047:9530812] hello
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2018-07-15 21:17:44.451739+0800 cyTest[31047:9530812] word
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2018-07-15 21:17:44.451986+0800 cyTest[31047:9530812] god
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2018-07-15 21:17:44.452233+0800 cyTest[31047:9530812] chenzixuan
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2018-07-15 21:17:44.453020+0800 cyTest[31047:9530812] index is 1
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2018-07-15 21:17:44.453332+0800 cyTest[31047:9530812] chen say 拜拜
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2018-07-15 21:17:44.453581+0800 cyTest[31047:9530812] chenyu say 拜拜
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2018-07-15 21:17:44.453803+0800 cyTest[31047:9530812] chengongyu say 拜拜
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2018-07-15 21:17:44.454188+0800 cyTest[31047:9530812] 正在处理第0个元素:chenyu
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2018-07-15 21:17:44.454456+0800 cyTest[31047:9530812] 正在处理第1个元素:hello
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2018-07-15 21:17:44.455253+0800 cyTest[31047:9530812] 正在处理第2个元素:word
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2018-07-15 21:17:44.478747+0800 cyTest[31047:9530812] 正在处理第3个元素:god
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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
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NSMutableArray *muArray = [NSMutableArray arrayWithObjects:@"chen", @"yu", @"hello", @"word", nil];
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[muArray addObject:@"123"];
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[muArray removeObject:@"yu"];
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[muArray replaceObjectAtIndex:1 withObject:@"xx"];
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for (id ob in muArray) {
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NSLog(@"ob is %@", ob);
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}
6、结果
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2018-07-18 22:02:57.498997+0800 cyTest[31429:12701122] ob is chen
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2018-07-18 22:02:57.600036+0800 cyTest[31429:12701122] ob is xx
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2018-07-18 22:02:57.600599+0800 cyTest[31429:12701122] ob is word
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2018-07-18 22:02:57.600824+0800 cyTest[31429:12701122] ob is 123
文章来源: chenyu.blog.csdn.net，作者：chen.yu，版权归原作者所有，如需转载，请联系作者。
原文链接：chenyu.blog.csdn.net/article/details/81057159
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