//====================NSStirng 的常见用法====================
-(void)testString
{
//创建格式化字符串:占位符（由一个%加一个字符组成）
NSString* str1 = [NSString stringWithFormat:@"the first string!"];
NSLog(@"one:::%@",str1);
NSString* str2 = [[NSString alloc]initWithString:@"the second string!"];
NSLog(@"two:::%@",str2);
//从文件中读取字符串
NSString* path = [[NSBundle mainBundle]pathForResource:@"strings" ofType:@"txt"];
// NSDictionary* contents = [[NSDictionary alloc]initWithContentsOfFile:path];
// NSArray* keys = [contents allKeys];
NSString* asstring = [[NSString alloc]initWithContentsOfFile:path];
NSLog(@"three:::%@",asstring);
//比较两个字符串
NSString* str3 = @"This is a String!";
NSString* str4 = @"This is a String! tyutuy";
BOOL result = [str3 isEqualToString:str4];
NSLog(@"the result is %d",result);
//输出大小写字母
NSLog(@"upper 大写字母：%@",[str3 uppercaseString]);//大写
//调用appendFormat追加字符串
NSMutableString* muString = [[NSMutableString alloc]initWithString:@"this is a string!"];
[muString appendFormat:@"ending is end!"];
NSLog(@"the result is %@",muString);
//调用appendString方法追加字符串
[muString appendString:@"good life is coming!"];
NSLog(@"%@",muString);
//在指定位置插入字符串
[muString insertString:@"iiiiiii " atIndex:0];
NSLog(@"%@",muString);
[muString setString:@"sajfk;sadjflsajfkls"];
NSLog(@"%@",muString);
//用指定字符串替换字符串中某指定位置、长度的字符串
[muString replaceCharactersInRange:NSMakeRange(0, 2) withString:@"==="];
NSLog(@"%@",muString);
//文件扩展名
NSString* pathString = @"~/记录.txt";
NSLog(@"Extension:%@",[pathString pathExtension]);
}
//====================NSStirng 的常见用法====================