NSString *str1 = @"aBcDeFgHiJk";
NSString *str2 = @"12345";
NSString *res;
NSComparisonResult compareResult;
NSRange subRange;
//字符个数
NSLog(@"字符串str1长度: %i",[str1 length]);
//拷贝字符串到res
res = [NSString stringWithString: str1];
NSLog(@"拷贝: %@", res);
//拷贝字符串到str1尾部
str2 = [str1 stringByAppendingString: str2];
NSLog(@"连接字符串: %@", str2);
//测试字符串相等
if ([str1 isEqualToString: res] == YES) {
NSLog(@"str1 == res");
} else {
NSLog(@"str1 != res");
}
//测试字符串 < > ==
compareResult = [str1 compare: str2];
if (compareResult == NSOrderedAscending) {
NSLog(@ "str1 < str2");
} else if (compareResult == NSOrderedSame) {
NSLog(@ "str1 == str2");
} else {
NSLog(@ "str1 > str2");
}
res = [str1 uppercaseString];
NSLog(@"大写字符串：%@", res);
res = [str1 lowercaseString];
NSLog(@"小写字符串：%@", res);
NSLog(@"原始字符串： %@", str1);
//获得前三个数
res = [str1 substringToIndex: 3];
NSLog(@"字符串str1的前三个字符: %@",res);
res = [str1 substringFromIndex: 4];
NSLog(@"截取字符串，从第索引4到尾部: %@",res);
res = [[str1 substringFromIndex: 3] substringToIndex: 2];
NSLog(@"截取字符串，从第索引3到5: %@",res);
//字符串查找
subRange = [str2 rangeOfString: @"34"];
if (subRange.location == NSNotFound) {
NSLog(@"字符串没有找到");
} else {
NSLog (@"找到的字符串索引 %i 长度是 %i",
subRange.location, subRange.length);
}
2012-10-09 11:00:31.955 2.10.2-1[27147:403] 字符串str1长度: 11
2012-10-09 11:00:31.958 2.10.2-1[27147:403] 拷贝: aBcDeFgHiJk
2012-10-09 11:00:31.959 2.10.2-1[27147:403] 连接字符串: aBcDeFgHiJk12345
2012-10-09 11:00:31.960 2.10.2-1[27147:403] str1 == res
2012-10-09 11:00:31.961 2.10.2-1[27147:403] str1 < str2
2012-10-09 11:00:31.962 2.10.2-1[27147:403] 大写字符串：ABCDEFGHIJK
2012-10-09 11:00:31.963 2.10.2-1[27147:403] 小写字符串：abcdefghijk
2012-10-09 11:00:31.964 2.10.2-1[27147:403] 原始字符串： aBcDeFgHiJk
2012-10-09 11:00:31.965 2.10.2-1[27147:403] 字符串str1的前三个字符: aBc
2012-10-09 11:00:31.965 2.10.2-1[27147:403] 截取字符串，从第索引4到尾部: eFgHiJk
2012-10-09 11:00:31.967 2.10.2-1[27147:403] 截取字符串，从第索引3到5: De
2012-10-09 11:00:31.967 2.10.2-1[27147:403] 找到的字符串索引 13 长度是 2
NSString *str1 = @"Objective C";
NSString *search,*replace;
NSMutableString *mstr;
NSRange substr;
//从不可变的字符创建可变字符串对象
mstr = [NSMutableString stringWithString: str1];
NSLog(@" %@", mstr);
//插入字符串
[mstr insertString: @ " Java" atIndex: 9];
NSLog(@" %@", mstr);
//具有连接效果的插入字符串
[mstr insertString: @ " and C++"atIndex: [mstr length]];
NSLog(@" %@", mstr);
//字符串连接方法
[mstr appendString: @ " and C"];
NSLog(@" %@", mstr);
//使用NSRange删除字符串
[mstr deleteCharactersInRange:NSMakeRange(16, 13)];
NSLog(@" %@", mstr);
//查找字符串位置
substr = [mstr rangeOfString: @ "string B and"];
if (substr.location != NSNotFound) {
[mstr deleteCharactersInRange: substr];
NSLog(@" %@", mstr);
}
//直接设置可变字符串
[mstr setString: @ "This is string A "];
NSLog(@" %@", mstr);
[mstr replaceCharactersInRange: NSMakeRange(8, 8)
withString: @ "a mutable string "];
NSLog(@" %@", mstr);
//查找和替换
search = @"This is ";
replace = @"An example of ";
substr = [mstr rangeOfString:search];
if (substr.location != NSNotFound) {
[mstr replaceCharactersInRange:substr withString: replace];
NSLog(@" %@", mstr);
}
//查找和替换所有的情况
search = @"a";
replace = @"X";
substr = [mstr rangeOfString: search];
while (substr.location != NSNotFound) {
[mstr replaceCharactersInRange:substr withString: replace];
substr = [mstr rangeOfString: search];
}
NSLog(@" %@", mstr);
2012-10-09 10:55:21.925 2.10.2-2[27120:403] Objective C
2012-10-09 10:55:21.928 2.10.2-2[27120:403] Objective Java C
2012-10-09 10:55:21.929 2.10.2-2[27120:403] Objective Java C and C++
2012-10-09 10:55:21.930 2.10.2-2[27120:403] Objective Java C and C++ and C
2012-10-09 10:55:21.930 2.10.2-2[27120:403] Objective Java CC
2012-10-09 10:55:21.931 2.10.2-2[27120:403] This is string A
2012-10-09 10:55:21.932 2.10.2-2[27120:403] This is a mutable string
2012-10-09 10:55:21.933 2.10.2-2[27120:403] An example of a mutable string
2012-10-09 10:55:21.934 2.10.2-2[27120:403] An exXmple of X mutXble string
