Objective-C 数组、可变数组

数组的使用方式

下面是数组：类型NSArray

#import <UIKit/UIKit.h>
#import "AppDelegate.h"

int main(int argc, char * argv[]) {
    
    // 通过@符号创建数组
    NSArray *arr = @[@"Hello",@"jinpangpang"];
    
    // 通过工厂方法创建数组
    NSArray *arr2 = [NSArray arrayWithObjects:@"Hello",@"jinpangpang", nil];
    
    // 通过配置文件读取数组
    NSArray *arr3 = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle]
                pathForResource:@"data" ofType:@"plist"]];
    
    for (int i = 0; i<[arr count]; i++) {
        NSLog(@"%@",[arr objectAtIndex:i]);
    }
    
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

 

可变数组 NSMutableArray

    NSMutableArray *arr = [[NSMutableArray alloc] init]; // 开辟一个可变数组对象
    for (int i=0;i<100; i++) {
        [arr addObject:[NSString stringWithFormat:@"值：%d",i]]; // 添加值
    }
    
    for (int i = 0 ; i<[arr count]; i++) {    // 遍历输出
        NSLog(@"%@",[arr objectAtIndex:i]);
    }