IOS开发基础字符串常用操作.docxVIP

IOS开发中，字符串NSString常用操作如下：字符串的截取NSString *string1=@欢迎访问 doubleicon 的博客;??? ? //NSString *search=@doubleicon;??? ? //NSRange range=[string1 rangeOfString:search];??? ? //截取字符串，从起始点到index之间的内容??? ? NSString *toindex=[string1 substringToIndex:6];??? ? self.label.text=toindex;??? ?? ?? ? //截取字符串index到结尾之间的内容??? ? NSString *fromindex=[string1 substringFromIndex:5];??? ? self.label1.text=fromindex;??? ?? ?? ? //设置截取字符串的范围??? ? NSRange range=NSMakeRange(0,4);??? ? NSString *stringrange=[string1 substringWithRange:range];??? ? self.label2.text=stringrange;??字符串的比较isEqualToString 比较字符串是否完全相等hasPrefix 匹配字符串的头部hasSuffix 匹配字符串的尾部NSString *string1=@doubleicon;??? ? NSString *string2=@double;??? ? //比较字符串是否完全相等??? ? if([string1 isEqualToString:string2]){??? ?? ???//相等??? ? }??? ?? ?? ? //匹配字符串的头部??? ? if([string1 hasPrefix:@double]){??? ?? ?? ??? ? }??? ? //匹配字符串的尾部??? ? if([string1 hasSuffix:@icon]){??? ?? ?? ??? ? }??多行书写字符串常量NSString *str1=@欢迎访问??? ?? ?? ?? ?? ?? ???doubleicon??? ?? ?? ?? ?? ?? ???CSDN博客;??? ? NSString *str2=@欢迎访问\?? ?? ?? ?? ?? ?? ???doubleicon \?? ?? ?? ?? ?? ?? ???CSDN博客;??字符串的分割NSString *str=@欢,迎,访,问,doubleicon,的,博,客;??? ?? ?NSArray *array = [str componentsSeparatedByString:@,];??? ?for (int i = 0; i [array count]; i++) {??? ?? ? NSLog(@str:%@, [array objectAtIndex:i]);??? ?}??字符串大小的比较NSString *string1=@this is a string;??? ?NSString *string2=@this is a string;??? ???? ?//compare方法(comparer返回的三种值)??? ?BOOL result=[string1 compare:string2]==NSOrderedSame;??? ?NSLog(@result:%d,result);??? ?//NSOrderedSame判断两者内容是否相同??? ???? ?NSString *string3=@This is a string;??? ?NSString *string4=@this is a string;??? ???? ?BOOL result1=[string3 compare:string4]==NSOrderedAscending;??? ?NSLog(@result1:%d,result1);??? ?//NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)??? ???? ?NSString *string5=@this is a string;??? ?NSString *string6=@this is;??? ?BOOL result2 = [string5 compare:string6] == NSOrderedDescending;??? ?NSLog(@result2:%d,result2);??? ?//NSOrderedD