从0开始学习OC程序-第13天

Foundation 框架简单学习

//
// main.m
// Foundation学习
//
// Created by 北国 on 16/3/18.
// Copyright © 2016年 beiguo. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {

        NSString *str = @"i love oc";

        NSRange r = NSMakeRange(2, 4);

        NSRange nsr = [str rangeOfString:@"love"];
        NSLog(@"location = %ld,length=%ld",nsr.location,nsr.length);

        NSPoint np = CGPointMake(10, 20);

        CGRect cr = CGRectMake(0, 0, 0, 0);

        NSString *st1 = @"123";

        //C语言字符串转成OC字符串
        NSString *st2 = [[NSString alloc] initWithUTF8String:"xxx"];

        //OC字符串转成C语言字符串
        char *cs = [st2 UTF8String];

        //从字符串中读取然后显示给用户
        NSString *st3 = [[NSString alloc]initWithContentsOfFile:@"/User/..." encoding:NSUTF8StringEncoding error:nil];

        //NSString 为不可变字符串
        //NSMutableString 可变字符串
        NSMutableString * nus = [NSMutableString stringWithFormat:@"haha"];
        [nus appendString:@"eee"];
        NSLog(@"%@",nus);

        NSRange nr11 = [nus rangeOfString:@"ae"];

        [nus deleteCharactersInRange:nr11];

        NSLog(@"%@",nus);


        //NSArray 不可变 NSMutableArray 可变数组
        NSArray *array = @[@"wwww",@"xxxx"];
        for (id obj in array) {
            NSLog(@"array is %@",obj);
        }

        //NSSet 没有顺序的集合
        NSSet *set = [NSSet set];
        NSSet *set1 = [NSSet setWithObjects:@"xx",@"xxx",@"xxxx", nil];
        NSString *stttt = [set1 anyObject];
        NSLog(@"stttt is %@",stttt);
        //NSDictionary NSMutableDicionary
        NSDictionary *dict = @{@"name" : @"北国",@"address":@"黑龙江"};

        id obj = dict[@"name"];

        //字典遍历
        NSArray *keys = [dict allKeys];
        for (int i=0; i<dict.count; i++) {
            NSLog(@"key is %@, value is %@",keys[i],dict[keys[i]]);
        }

        NSLog(@"%@",obj);
    }
    return 0;
}