Foundation --- 字符串的获取

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#import <Foundation/Foundation.h>int main(int argc, const char * argv[]) {    @autoreleasepool {        // insert code here...                //1.获取字符串的长度        NSString *str = @"ding";//        NSUInteger length = [str length];        NSUInteger length = str.length;        NSLog(@"字符串长度:%lu",length);                //2.根据索引获得单个字符        NSString *str2 = @"www.summer.hello";        //如果定的索引值,超出了字符串的长度,会导致异常Range or index out of bounds        unichar c = [str2 characterAtIndex:9];        NSLog(@"字符c:%c",c);                //3.根据索引获得一个字串        NSString *str3 = @"www.summer.hello";        NSString *tempStr = [str3 substringFromIndex:3];        //substringFromIndex 从指定的索引开始(包含该索引位置)截取到字符串末尾        NSLog(@"substringFromIndex:%@",tempStr);                NSString *tempStr2 = [str3 substringToIndex:3];        //substringToIndex 截取字符串到给定的位置结束,不包含该索引位置        NSLog(@"substringToIndex:%@",tempStr2);                NSString *tempStr3 = [str3 substringWithRange:NSMakeRange(0, 3)];        //substringWithRange:NSMakeRange(0, 3) 从第零个字符串开始截取,长度为3个字符        NSLog(@"substringWithRange:%@",tempStr3);                //4.获取字符串的某一段        NSRange rang = {4,6};//{location,length}        NSString *tempStr4 = [str3 substringWithRange:rang];        NSLog(@"substringWithRange:%@",tempStr4);                //5.获得一个字符串的位置        NSString *tempStr5 = @"summer";        NSRange tempRange = [str3 rangeOfString:tempStr5];        NSLog(@"location:%ld,length:%ld",tempRange.location,tempRange.length);                if (tempRange.length == NSNotFound) {            NSLog(@"temp5 不在 str3 中");        }        else        {            NSLog(@"rangOfString %@",NSStringFromRange(tempRange));        }                //6.获得一个字符串索引范围        NSRange tempRange2 = [str3 rangeOfString:@"summer" options:NSCaseInsensitiveSearch];        NSLog(@"rangOfstring1 %@",NSStringFromRange(tempRange2));            }    return 0;}
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