#import <Foundation/Foundation.h>
void test(){
    NSString *str = @"http://www.itheima.com";
   
    //截取
    NSString *strSub = [str substringFromIndex:10];
    NSLog(@"strSub = %@",strSub);
   
    NSString *strSub1 = [str substringToIndex:4];
    NSLog(@"strSub1 = %@",strSub1);
   
    //        NSRange r1 = {2,7};                            r1
    NSString *strSub2 = [str substringWithRange:NSMakeRange(2, 7)];
    NSLog(@"strSub2 = %@",strSub2);
}



int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSString *str = @"<itcast>传智播客X好</itcast>";

//1,找到@">"首次出现的位置,+1  得到要截取的起始位置
        NSRange r1 = [str rangeOfString:@">"];
        NSUInteger loc1 = r1.location + 1;
//2,找到 @"</"的位置-loc1,得到要截取的内容的长度
        NSUInteger len = [str rangeOfString:@"</"].location - loc1;
//3,使用loc1和Len 构建一个新的range,然后截取这个range的字符串
        NSRange r2 = {loc1,len};
//4,使用substringWithRange 截取一个范围
        NSString *subStr = [str substringWithRange:r2];
        NSLog(@"subStr = %@",subStr);
        
        
        NSString *strNew = [str stringByReplacingOccurrencesOfString:@"传智播客X好" withString:@"艾水水"];
        NSLog(@"strNew = %@",strNew);
    }
    return 0;
}

#import <Foundation/Foundation.h>
void test(){
    NSString *str = @"http://www.itheima.com";
   
    //截取
    NSString *strSub = [str substringFromIndex:10];
    NSLog(@"strSub = %@",strSub);
   
    NSString *strSub1 = [str substringToIndex:4];
    NSLog(@"strSub1 = %@",strSub1);
   
    //        NSRange r1 = {2,7};                            r1
    NSString *strSub2 = [str substringWithRange:NSMakeRange(2, 7)];
    NSLog(@"strSub2 = %@",strSub2);
}



int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSString *str = @"<itcast>传智播客X好</itcast>";

//1,找到@">"首次出现的位置,+1  得到要截取的起始位置
        NSRange r1 = [str rangeOfString:@">"];
        NSUInteger loc1 = r1.location + 1;
//2,找到 @"</"的位置-loc1,得到要截取的内容的长度
        NSUInteger len = [str rangeOfString:@"</"].location - loc1;
//3,使用loc1和Len 构建一个新的range,然后截取这个range的字符串
        NSRange r2 = {loc1,len};
//4,使用substringWithRange 截取一个范围
        NSString *subStr = [str substringWithRange:r2];
        NSLog(@"subStr = %@",subStr);
        
        
        NSString *strNew = [str stringByReplacingOccurrencesOfString:@"传智播客X好" withString:@"艾水水"];
        NSLog(@"strNew = %@",strNew);
    }
    return 0;
}