NSString基础2-判断前缀、后缀、分割、截取、拼接、查询

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
@autoreleasepool {
//判断字符串前缀
NSString *str1=@"iOS-study";
BOOL result1=[str1 hasPrefix:@"iOS"];
//判断字符串后缀
NSString *str2=@"study.jpg";
BOOL result2=[str2 hasSuffix:@".jpg"];
//分割字符串
NSString *str3=@"i am a new programmer";
NSArray *array=[str3 componentsSeparatedByString:@" "];     //根据给定字符分割
NSLog(@"%@",array);     //直接打印数组（一般不允许用在正式程序中）
//截取字符串
NSString *str4=[str3 substringToIndex:4];       //从字符串开始截取到第4位之前
NSString *str5=[str3 substringFromIndex:4];     //从第4位开始截取到字符串末位
//根据位置和截取长度截取字符串
NSRange rang1;
rang1.location=7;
rang1.length=3;
NSString *str6=[str3 substringWithRange:rang1];      //根据rang截取第7位开始的3个字符
NSRange rang2=[str3 rangeOfString:@"programmer"];       //获得字符串的起始位置和长度
//拼接字符串
NSString *str7=@"Good",*str8=@"bye";
NSString *str9=[[NSString alloc]initWithFormat:@"%@%@",str7,str8];      //实例初始化法拼接
NSString *str10=[str7 stringByAppendingString:str8];       //直接拼接
NSString *str11=[str7 stringByAppendingFormat:@"-%@",str8];        //拼接中加入其他字符
//查询字符串
NSRange rang3=[str3 rangeOfString:@"new"];      //查询字符串的位置
NSLog(@"%@",NSStringFromRange(rang3));      //显示字符串所在位置
if(rang3.location==NSNotFound){
NSLog(@"Can't find");
}
else{
NSLog(@"location=%ld,length=%ld",rang3.location,rang3.length);
}
}
return 0;
}