OC蜕变第七天

@protocol SportProtocol <NSObject>
//方法的声明
- (void)playFootball;
- (void)playBasketball;
- (void)playBaseball;
@end

#import "SportProtocol.h" // 导入协议的头文件
@interface Studnet : NSObject <SportProtocol> // 遵守协议
@end

@implementation Student
// 实现协议方法
- (void)playBasketball
{
    NSLog(@"%s", __func__);
}
// 实现协议方法
- (void)playFootball
{
    NSLog(@"%s", __func__);
}
@end

@protocol SportProtocol <NSObject>
{
    int _age; // 错误,不能声明成员变量
}
- (void)playFootball;
- (void)playBasketball;
@end

@protocol SportProtocol <NSObject>

- (void)playFootball;
- (void)playBasketball;
@end

#import "SportProtocol.h"
@interface Student : NSObject <SportProtocol>
@end

@interface GoodStudent : Student
@end

@implementation GoodStudent
- (void)playFootball
{
    NSLog(@"%s", __func__);
}
- (void)playBasketball
{
    NSLog(@"%s", __func__);
}
@end

#import "SportProtocol.h"
#import "StudyProtocol.h"

@interface Student : NSObject <SportProtocol, StudyProtocol>

@end

@protocol A
-(void)methodA;
@end

#import "A.h"
@protocol B <A>
-(void)methodB;
@end

#import "B.h"
@interface Student : NSObject <B>
//同时拥有A/B协议中的方法声明
-(void)methodA;
-(void)methodB;
@end

@protocol SportProtocol <NSObject> // 基协议

- (void)playFootball;
- (void)playBasketball;
@end

@protocol SportProtocol <NSObject>

@required // 如果遵守协议的类不实现会报警告
- (void)playFootball;
@optional //如果遵守协议的类不实现不会报警告
- (void)playBasketball;
- (void)playBasketball;
@end

@protocol WifeCondition<NSObject>
- (void)cooking;
- (void)washing;
- (void)job;
@end

// 如果没有遵守协议则会报警告
id<WifeCondition> wife = [[Person alloc] init];

if([self.wife respondsToselector:@selector(cooking)])
{
    [self.wife cooking];
}

// 协议
#import <Foundation/Foundation.h>
@class Baby;

@protocol BabyProtocol <NSObject>
- (void)feedWithBaby:(Baby *)baby;
- (void)hypnosisWithBaby:(Baby *)baby;
@end

#import "BabyProtocol.h"
@interface Baby : NSObject
// 饥饿程度
@property (nonatomic, assign) int food;
// 睡意
@property (nonatomic, assign) int drowsiness;
// 饿
- (void)hungry;
// 困意
- (void)sleepy;
//如果使用id类型接收保姆,当换保姆时,婴儿类不需要修改
@property (nonatomic, strong) id<BabyProtocol> nanny;
@end

@implementation Baby

- (void)hungry
{
    self.food -= 5;
    NSLog(@"婴儿饿了");
    // 通知保姆
    if ([self.nanny respondsToSelector:@selector(feedWithBaby:)]) {
        [self.nanny feedWithBaby:self];
    }
}

- (void)sleepy
{
    self.drowsiness += 5;
    NSLog(@"婴儿困了");
    // 通知保姆
    //判断方法有没有在代理对象中实现
    //没有实现协议中的方法没有实现,提前报错,提前预知是哪里有错误
    if ([self.nanny respondsToSelector:@selector(hypnosisWithBaby:)]) {
        [self.nanny hypnosisWithBaby:self];
    }
}
@end

// 保姆
@interface Nanny : NSObject <BabyProtocol>
@end

@implementation Nanny

- (void)feedWithBaby:(Baby *)baby
{
    baby.food += 10;
    NSLog(@"给婴儿喂奶, 现在的食量是%i", baby.food);
}

- (void)hypnosisWithBaby:(Baby *)baby
{
    baby.drowsiness += 10;
    NSLog(@"哄婴儿睡觉, 现在的睡意是%i", baby.drowsiness);
}
@end

// 用来保存错误信息
NSError *error = nil;

// 读取文件内容
NSString *str = [NSString
//全路径/绝对路径
stringWithContentsOfFile:@"/Users/MJ-Hee/Desktop/hmj.txt"
//编码
encoding:NSUTF8StringEncoding
//指向指针的指针
error:&error];

// 如果有错误信息
if (error) {
    NSLog(@"读取失败, 错误原因是:%@", [error localizedDescription]);
} else {
    // 如果没有错误信息
    NSLog(@"读取成功, 文件内容是:\n%@", str);
}

NSString *str = @"贺梦洁";
BOOL flag = [str writeToFile:@"/Users/MJ-Hee/Desktop/hmj.txt"
atomically:YES encoding:NSUTF8StringEncoding error:nil];
if (flag == 1)
{
    NSLog(@"写入成功");
}

NSString *str1 = @"贺梦洁";
BOOL flag = [str1 writeToFile:@"/Users/MJ-Hee/Desktop/hmj.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil];

NSString *str2 = @"贺梦洁";
[str2 writeToFile:@"/Users/MJ-Hee/Desktop/hmj.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil];

NSString *str = [NSString stringWithContentsOfFile:@"/Users/MJ-Hee/Desktop/hmj.txt" encoding:NSUTF8StringEncoding error:&error];
NSLog(@"str = %@", str);

输出结果:贺梦洁

NSURL *url = [NSURL URLWithString:@"file://192.168.14.37/Users/MJ-Hee/Desktop/str.txt"];

NSURL *url = [NSURL fileURLWithPath:@"/Users/MJ-Hee/Desktop/str.txt"];

// 用来保存错误信息
NSError *error = nil;

// 创建URL路径
//    NSString *path = @"file://192.168.199.119/Users/MJ-Hee/Desktop/hmj.txt";

//  本机可以省略主机域名
//    NSString *path = @"file:///Users/MJ-Hee/Desktop/hmj.txt";
    NSURL *url = [NSURL URLWithString:path];

//  利用fileURLWithPath方法创建出来的URL默认协议头为file://
NSURL *url = [NSURL fileURLWithPath:@"/Users/MJ-Hee/Desktop/hmj.txt"];

// 读取文件内容
NSString *str = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];

// 如果有错误信息
if (error) {
    NSLog(@"读取失败, 错误原因是:%@", [error localizedDescription]);
} else { // 如果没有错误信息
    NSLog(@"读取成功, 文件内容是:\n%@", str);
}

    NSString *str1 = @"hmj";
    NSString *str2 = [NSString stringWithFormat:@"hmj"];

    //比较字符串内容是否相同
    if ([str1 isEqualToString:str2]) {
        NSLog(@"字符串内容一样");
    }

    //是比较字符串的地址是否相同
    if (str1 == str2) {
        NSLog(@"字符串地址一样");
    }

    NSString *str1 = @"abc";
    NSString *str2 = @"abd";
    switch ([str1 compare:str2]) {
        case NSOrderedAscending:
            NSLog(@"后面一个字符串大于前面一个");
            break;
        case NSOrderedDescending:
            NSLog(@"后面一个字符串小于前面一个");
            break;
        case NSOrderedSame:
            NSLog(@"两个字符串一样");
            break;
    }
    输出结果: 后面一个字符串大于前面一个

typedef struct _NSRange {
    NSUInteger location;
    NSUInteger length;
} NSRange;
// NSUInteger的定义
typedef unsigned int NSUInteger;

NSString *str = @"<head>小码哥</head>";
    str = [str substringFromIndex:7];
    NSLog(@"str = %@", str);

输出结果: 小码哥</head>

    NSString *str = @"<head>小码哥</head>";
    str = [str substringToIndex:10];
    NSLog(@"str = %@", str);

输出结果: <head>小码哥


//<head>小码哥</head>-->小码哥</head>-->小码哥
NSString *str = @"<head>小码哥</head>";
NSUInteger location = [str rangeOfString:@">"].location + 1;
NSString *newStr = [str substringFromIndex:location];
location = [str rangeOfString:@"</"].location - 1;
str = [newstr substringToIndex:location];
NSLog(@"str = %@", str);

<head>小码哥</head>--><head>小码哥-->小码哥

   NSString *str = @"<head>小码哥</head>";
    NSRange range;
    //NSRange range = {6, 3};
    /*
    range.location = 6;
    range.length = 3;
    */
    //只要是OC提供的结构体,一般都可以使用NSMakeXXX来创建
    //NSRange range = NSMakeRange(6, 3);

    //动态获取起始位置
    range.location = [str rangeOfString:@">"].location + 1;
    //NSUInteger location = [str rangeOfString:@">"].location + 1;

    //动态获取截取长度
    range.length = [str rangeOfString:@"</"].location - range.location;
    //NSUInteger length = [str rangeOfString:@"<" options:NSBackwardsSearch].location - location;
    //NSRange range = NSMakeRange(location, length);

    //截取字符串
    NSString *res = [str substringWithRange:range];
    //输出截取的字符串
    NSLog(@"res = %@", res);
输出结果: 小码哥

//将&替换成/
    NSString *str = @"http:**520it.com*img*hmj.gif";
    //OccurrencesOfString:被替换的字符串
    //withString:用什么字符串替换
    NSString *newStr = [str stringByReplacingOccurrencesOfString:@"*" withString:@"/"];
    NSLog(@"newStr = %@", newStr);

输出结果: http://www.520it.com/img/ljn.gif

    NSString *str =  @"   http://520it.com/img/ljn.gif   ";
    NSCharacterSet *set = [NSCharacterSet whitespaceCharacterSet];
    NSString *newStr = [str stringByTrimmingCharactersInSet:set];
    NSLog(@"str =|%@|", str);
    NSLog(@"newStr =|%@|", newStr);

输出结果:
str =|   http://520it.com/img/hmj.gif   |
newStr =|http://520it.com/img/hmj.gif|

    NSString *str =  @"***http://520it.com/img/ljn.gif***";
    NSString *newStr = [str stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"*"]];

    NSLog(@"str =|%@|", str);
    NSLog(@"newStr =|%@|", newStr);

输出结果:
str =|***http://520it.com/img/hmj.gif***|
newStr =|http://520it.com/img/hmj.gif|

 NSString *str =  @"   http://520it.com/img/hmj.gif   ";
     NSCharacterSet *set = [NSCharacterSet uppercaseLetterCharacterSet];
    NSString *newStr = [str stringByTrimmingCharactersInSet:set];
    NSLog(@"str =|%@|", str);
    NSLog(@"newStr =|%@|", newStr);

输出结果:
str =|HTTP://520it.com/img/hmj.GIF|
newStr =|://520it.com/img/hmj.|

 // 其实就是判断是否以/开头
//    NSString *str = @"/Users/MJ-Hee/Desktop/hmj.txt";
    NSString *str = @"Users/MJ-Hee/Desktop/hmj.txt";
    if ([str isAbsolutePath]) {
        NSLog(@"是绝对路径");
    }else
    {
        NSLog(@"不是绝对路径");
    }

结果:不是绝对路径

    // 截取最后一个/后面的内容
    NSString *str = @"/Users/MJ-Hee/Desktop/hmj.txt";
    NSString *component = [str lastPathComponent];
    NSLog(@"component = %@", component);

结果:hmj.txt

 // 其实就是上次最后一个/和之后的内容
    NSString *str = @"/Users/MJ-Hee/Desktop/hmj.txt";
    NSString *newStr = [str stringByDeletingLastPathComponent];
    NSLog(@"newStr = %@", newStr);

结果:/Users/MJ-Hee/Desktop

// 其实就是在最后面加上/和要拼接得内容
    // 注意会判断后面有没有/,有就不添加了, 没有就添加, 并且如果有多个会替换为1个
//    NSString *str = @"/Users/MJ-Hee/Desktop";
    NSString *str = @"/Users/MJ-Hee/Desktop/";
    NSString *newStr = [str stringByAppendingPathComponent:@"hmj"];
    NSLog(@"newStr = %@", newStr);

结果:/Users/MJ-Hee/Desktop/hmj

  // 其实就是从最后面开始截取.之后的内容
//    NSString *str = @"hmj.txt";
    NSString *str = @"abc.hmj.txt";
    NSString *extension = [str pathExtension];
    NSLog(@"extension = %@", extension);

结果:txt

// 其实就是上次从最后面开始.之后的内容
//    NSString *str = @"hmj.txt";
    NSString *str = @"abc.hmj.txt";
    NSString *newStr = [str stringByDeletingPathExtension];
    NSLog(@"newStr = %@", newStr);

结果:abc.hmj

// 其实就是在最后面拼接上.和指定的内容
    NSString *str = @"hmj";
    NSString *newStr = [str stringByAppendingPathExtension:@"gif"];
    NSLog(@"newStr = %@", newStr);

结果:hmj.gif