NSString *Beijing= @"北京欢迎您"; //字符串的声明
NSString *log=@"北京欢迎您a"; //[NSString stringWithFormat:@"I am '%@'",Beijing]; //字符串格式化
NSString *zhui = [Beijing stringByAppendingString:@"哈哈哈"]; //字符串追加
bool b=[Beijing isEqualToString:log]; //字符串比较
NSString *hh = @"http://www.sina.com.cn";
if([hh hasPrefix:@"http"]){ //查找以http开头的字符串
NSLog(@"含有http");
}else{
NSLog(@"没有http");
}
NSString *ss = @"123";
int a = [ss intValue]+13; //字符串转int型
double dd = [ss doubleValue]+33.3; //字符串转double型
NSLog(@"%g",dd);
//字符串转数组
NSString *zifuchuan =@"one,two,three,four";
NSLog(@"string:%@",zifuchuan);
NSArray *array = [zifuchuan componentsSeparatedByStr ing:@","];
// NSLog(@"array:%@",array); //输出整个数组中所有元素
NSString *value = [array objectAtIndex:0]; //取出第0个元素
NSLog(@"value:%@",value);
//数组转字符串
NSString * zifuchuan2 = [array componentsJoinedByString :@","];
NSLog(@"zifuchuan2:%@",zifuchuan2);
//-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringFromIndex:3];
NSLog(@"string2:%@",string2);
//-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
NSLog(@"string2:%@",string2);
//--------操作动态字符串--NSMutableString----------------------------------------------------
NSMutableString *mstr = [[NSMutableString alloc] init];
NSString *str1 = @"This is a example.";
//创建可变字符串
mstr = [NSMutableString stringWithString:str1];
//插入字符
[mstr insertString:@"very easy " atIndex:10];
//删除一些字符
[mstr deleteCharactersInRange:NSMakeRange(10,5)];
//查找并删除
NSRange substr = [mstr rangeOfString:@"example"]; //字符串查找,可以判断字符串中是否有
if (substr.location != NSNotFound) {
[mstr deleteCharactersInRange:substr];
}
//重新设置字符串
[mstr setString:@"This is string AAA"];
//替换字符串
[mstr replaceCharactersInRange :NSMakeRange(15, 2) withString:@"BBB"]; //从第15个字符串处替换掉后2个字符串
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