NSString代表字符序列不可变的字符串,功能更强大,更方便简单。
下面代码列举了大部分常用的NSString方法。
//
// main.m
// OcString
//
// Created by mac on 14-12-2.
// Copyright (c) 2014年 mac. All rights reserved.
//
#import <Foundation/Foundation.h>
void dynamicCreateString()
{
//1
NSString *str1 = @"neusoft i love you";
NSLog(@"%@",str1);
//2
NSString *str2 = [[NSString alloc]init];
[str2 release];
//使用oc字符串付初值
NSString *str3 = [[NSString alloc]initWithString:str1];
NSLog(@"%@",str3);
[str3 release];
//使用c语言的字符串初始化
NSString *str4 = [[NSString alloc] initWithUTF8String:"I love you"];
NSLog(@"%@",str4);
[str4 release];
//格式化创建方式
NSString *str5 = [[NSString alloc]initWithFormat:@"i am %i years old",10];
NSLog(@"%p, %@",str5,str5);
//[str5 release];
NSString *str6 = [str5 stringByAppendingString:str1];
NSLog(@"%p, %@",str6,str6);
[str5 release];
[str6 release];
//使用文件初始化
NSError * error;
NSString *str7 = [[NSString alloc]initWithContentsOfFile:@"/Users/mac/Desktop/a.txt" encoding:NSUTF8StringEncoding error:&error];
NSLog(@"%@, %@",str7,error);
NSString * path = @"file:///Users/mac/Desktop/a.txt";
NSString * httpContents = @"http://people.com.cn";
NSURL * url = [NSURL URLWithString:httpContents];
NSString *str8 = [[NSString alloc]initWithContentsOfURL:url encoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000) error:&error];
NSLog(@"%@, %@",str8,error);
[str8 release];
}
void staticCreateString()
{
NSString * str1 = [NSString stringWithFormat:@"i am %i years old",10];
NSLog(@"%@",str1);
}
#pragma mark 导出到文件中
void export()
{
//向文件中写入,持久化的过程
NSString * str = @"i was a child , i have a dreamer ";
NSString * path = @"file:///Users/mac/Desktop/a.txt";
NSError *error;
[str writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&error];
NSLog(@"%@",error);
NSURL * url = [NSURL URLWithString:path];
[str writeToURL:url atomically: YES encoding:NSUTF8StringEncoding error:&error];
NSLog(@"%@",error);
}
void otherMethord()
{
//请求字符串长度
NSLog(@"%lu",[@"abcd吴剑光" length]);
NSLog(@"%c",[@"abcd吴剑光" characterAtIndex:3]);
}
void caseMethord()
{
NSString * str = @"I'am boY ,i have a dream";
NSLog(@"%@",[str uppercaseString]);
NSLog(@"%@",[str lowercaseString]);
NSLog(@"%@",[str capitalizedString]);
}
void campareWithString()
{
NSString * str = @"Z'am boY ,i have a dream";
NSString * str1 = @"I'am boY ,i have a dream";
if ([str isEqualToString:str1]) {
NSLog(@"true");
}
NSLog(@"%li",[str compare:str1]);
}
void searchString()
{
NSString * str = @"neuZ'am boY ,i have a dream";
NSLog(@"%i",[str hasPrefix:@"neu"]);
NSLog(@"%i",[str hasSuffix:@"exm"]);
NSRange range1 = [str rangeOfString:@"have"];
NSLog(@"%lu,%lu",range1.location,range1.length);
NSRange range2 = [str rangeOfString:@"have" options:NSBackwardsSearch];
NSLog(@"%lu,%lu",range2.location,range2.length);
}
void subString()
{
NSString * str = @"neuZ'am #boY #i have# a dream";
NSLog(@"%@", [str substringFromIndex:3]);
NSLog(@"%@", [str substringToIndex:3]);
NSLog(@"%@", [str substringWithRange:NSMakeRange(3, 5)]);
NSArray * array = [str componentsSeparatedByString:@"#"];
NSLog(@"%@",array);
}
void pathString()
{
NSString * str = @"neuZ'am #boY #i have# a dream";
NSArray * array = [str componentsSeparatedByString:@"#"];
NSLog(@"%@", [NSString pathWithComponents:array]);
NSString * path = @"Users/mac/desktop";
NSLog(@"%@", [path pathComponents]);
NSLog(@"%i", [path isAbsolutePath]);
NSLog(@"%@", [path stringByAppendingPathComponent:@"abc"]);
NSLog(@"%@", path);
}
void extentionString()
{
NSString * path = @"/Users/mac/Desktop/a.txt";
NSLog(@"%@", [path pathExtension]);
NSLog(@"%@", [path stringByDeletingPathExtension]);
NSLog(@"%@", [path stringByAppendingPathExtension:@"xml"]);
}
void exchangeType()
{
NSString *str1 = @"234.2342424";
NSString *str2 = @"234.45";
NSString *str3 = @"234";
NSString *str4 = @"abcde";
NSLog(@"%f",[str1 doubleValue]);
NSLog(@"%f",[str2 floatValue]);
NSLog(@"%i",[str3 intValue]);
NSLog(@"%s",[str4 UTF8String]);
}
#pragma mark NSMutableString
void mutableStringOperation()
{
NSMutableString * str = [NSMutableString stringWithCapacity:10];
[str setString:@"i was girl"];
NSLog(@"%@", str);
[str appendFormat:@" %i years old", 10];
NSLog(@"%@", str);
[str replaceCharactersInRange:NSMakeRange(2, 3) withString:@"abcdekfslfj"];
NSLog(@"%@", str);
}
int main(int argc, const char * argv[]) {
@autoreleasepool {
mutableStringOperation();
exchangeType();
extentionString();
pathString();
subString();
searchString();
dynamicCreateString();
staticCreateString();
export() ;
otherMethord();
caseMethord();
campareWithString();
}
return 0;
// main.m
// OcString
//
// Created by mac on 14-12-2.
// Copyright (c) 2014年 mac. All rights reserved.
//
#import <Foundation/Foundation.h>
void dynamicCreateString()
{
//1
NSString *str1 = @"neusoft i love you";
NSLog(@"%@",str1);
//2
NSString *str2 = [[NSString alloc]init];
[str2 release];
//使用oc字符串付初值
NSString *str3 = [[NSString alloc]initWithString:str1];
NSLog(@"%@",str3);
[str3 release];
//使用c语言的字符串初始化
NSString *str4 = [[NSString alloc] initWithUTF8String:"I love you"];
NSLog(@"%@",str4);
[str4 release];
//格式化创建方式
NSString *str5 = [[NSString alloc]initWithFormat:@"i am %i years old",10];
NSLog(@"%p, %@",str5,str5);
//[str5 release];
NSString *str6 = [str5 stringByAppendingString:str1];
NSLog(@"%p, %@",str6,str6);
[str5 release];
[str6 release];
//使用文件初始化
NSError * error;
NSString *str7 = [[NSString alloc]initWithContentsOfFile:@"/Users/mac/Desktop/a.txt" encoding:NSUTF8StringEncoding error:&error];
NSLog(@"%@, %@",str7,error);
NSString * path = @"file:///Users/mac/Desktop/a.txt";
NSString * httpContents = @"http://people.com.cn";
NSURL * url = [NSURL URLWithString:httpContents];
NSString *str8 = [[NSString alloc]initWithContentsOfURL:url encoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000) error:&error];
NSLog(@"%@, %@",str8,error);
[str8 release];
}
void staticCreateString()
{
NSString * str1 = [NSString stringWithFormat:@"i am %i years old",10];
NSLog(@"%@",str1);
}
#pragma mark 导出到文件中
void export()
{
//向文件中写入,持久化的过程
NSString * str = @"i was a child , i have a dreamer ";
NSString * path = @"file:///Users/mac/Desktop/a.txt";
NSError *error;
[str writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&error];
NSLog(@"%@",error);
NSURL * url = [NSURL URLWithString:path];
[str writeToURL:url atomically: YES encoding:NSUTF8StringEncoding error:&error];
NSLog(@"%@",error);
}
void otherMethord()
{
//请求字符串长度
NSLog(@"%lu",[@"abcd吴剑光" length]);
NSLog(@"%c",[@"abcd吴剑光" characterAtIndex:3]);
}
void caseMethord()
{
NSString * str = @"I'am boY ,i have a dream";
NSLog(@"%@",[str uppercaseString]);
NSLog(@"%@",[str lowercaseString]);
NSLog(@"%@",[str capitalizedString]);
}
void campareWithString()
{
NSString * str = @"Z'am boY ,i have a dream";
NSString * str1 = @"I'am boY ,i have a dream";
if ([str isEqualToString:str1]) {
NSLog(@"true");
}
NSLog(@"%li",[str compare:str1]);
}
void searchString()
{
NSString * str = @"neuZ'am boY ,i have a dream";
NSLog(@"%i",[str hasPrefix:@"neu"]);
NSLog(@"%i",[str hasSuffix:@"exm"]);
NSRange range1 = [str rangeOfString:@"have"];
NSLog(@"%lu,%lu",range1.location,range1.length);
NSRange range2 = [str rangeOfString:@"have" options:NSBackwardsSearch];
NSLog(@"%lu,%lu",range2.location,range2.length);
}
void subString()
{
NSString * str = @"neuZ'am #boY #i have# a dream";
NSLog(@"%@", [str substringFromIndex:3]);
NSLog(@"%@", [str substringToIndex:3]);
NSLog(@"%@", [str substringWithRange:NSMakeRange(3, 5)]);
NSArray * array = [str componentsSeparatedByString:@"#"];
NSLog(@"%@",array);
}
void pathString()
{
NSString * str = @"neuZ'am #boY #i have# a dream";
NSArray * array = [str componentsSeparatedByString:@"#"];
NSLog(@"%@", [NSString pathWithComponents:array]);
NSString * path = @"Users/mac/desktop";
NSLog(@"%@", [path pathComponents]);
NSLog(@"%i", [path isAbsolutePath]);
NSLog(@"%@", [path stringByAppendingPathComponent:@"abc"]);
NSLog(@"%@", path);
}
void extentionString()
{
NSString * path = @"/Users/mac/Desktop/a.txt";
NSLog(@"%@", [path pathExtension]);
NSLog(@"%@", [path stringByDeletingPathExtension]);
NSLog(@"%@", [path stringByAppendingPathExtension:@"xml"]);
}
void exchangeType()
{
NSString *str1 = @"234.2342424";
NSString *str2 = @"234.45";
NSString *str3 = @"234";
NSString *str4 = @"abcde";
NSLog(@"%f",[str1 doubleValue]);
NSLog(@"%f",[str2 floatValue]);
NSLog(@"%i",[str3 intValue]);
NSLog(@"%s",[str4 UTF8String]);
}
#pragma mark NSMutableString
void mutableStringOperation()
{
NSMutableString * str = [NSMutableString stringWithCapacity:10];
[str setString:@"i was girl"];
NSLog(@"%@", str);
[str appendFormat:@" %i years old", 10];
NSLog(@"%@", str);
[str replaceCharactersInRange:NSMakeRange(2, 3) withString:@"abcdekfslfj"];
NSLog(@"%@", str);
}
int main(int argc, const char * argv[]) {
@autoreleasepool {
mutableStringOperation();
exchangeType();
extentionString();
pathString();
subString();
searchString();
dynamicCreateString();
staticCreateString();
export() ;
otherMethord();
caseMethord();
campareWithString();
}
return 0;
}