//
// main.m
// FoundationFramework
//
// Created by Kenshin Cui on 14-2-16.
// Copyright (c) 2014年 Kenshin Cui. All rights reserved.
//
#import <Foundation/Foundation.h>
/**字符串操作*/
void test1(){
char *str1="C string";//这是C语言创建的字符串
NSString *str2=@"OC string";//ObjC字符串需要加@，并且这种方式创建的对象不需要自己释放内存
//下面的创建方法都应该释放内存
NSString *str3=[[NSString alloc] init];
str3=@"OC string";
NSString *str4=[[NSString alloc] initWithString:@"Objective-C string"];
NSString *str5=[[NSString alloc] initWithFormat:@"age is %i,name is %.2f",19,1.72f];
NSString *str6=[[NSString alloc] initWithUTF8String:"C string"];//C语言的字符串转换为ObjC字符串
//以上方法都有对应静态方法（一般以string开头）,不需要管理内存（系统静态方法一般都是自动释放）
NSString *str7=[NSString stringWithString:@"Objective-C string"];
}
void test2(){
NSLog(@"\"Hello world!\" to upper is %@",[@"Hello world!" uppercaseString]);
//结果："Hello world!" to upper is HELLO WORLD!
NSLog(@"\"Hello world!\" to lowwer is %@",[@"Hello world!" lowercaseString]);
//结果："Hello world!" to lowwer is hello world!
//首字母大写，其他字母小写
NSLog(@"\"Hello world!\" to capitalize is %@",[@"Hello world!" capitalizedString]);
//结果："Hello world!" to capitalize is Hello World!
BOOL result= [@"abc" isEqualToString:@"aBc"];
NSLog(@"%i",result);
//结果：0
NSComparisonResult result2= [@"abc" compare:@"aBc"];//如果是[@"abc" caseInsensitiveCompare:@"aBc"]则忽略大小写比较
if(result2==NSOrderedAscending){
NSLog(@"left<right.");
}else if(result2==NSOrderedDescending){
NSLog(@"left>right.");
}else if(result2==NSOrderedSame){
NSLog(@"left=right.");
}
//结果：left>right.
}
void test3(){
NSLog(@"has prefix ab? %i",[@"abcdef" hasPrefix:@"ab"]);
//结果：has prefix ab? 1
NSLog(@"has suffix ab? %i",[@"abcdef" hasSuffix:@"ef"]);
//结果：has suffix ab? 1
NSRange range=[@"abcdefabcdef" rangeOfString:@"cde"];//注意如果遇到cde则不再往后面搜索,如果从后面搜索或其他搜索方式可以设置第二个options参数
if(range.location==NSNotFound){
NSLog(@"not found.");
}else{
NSLog(@"range is %@",NSStringFromRange(range));
}
//结果：range is {2, 3}
}
//字符串分割
void test4(){
NSLog(@"%@",[@"abcdef" substringFromIndex:3]);//从第三个索引开始（包括第三个索引对应的字符）截取到最后一位
//结果：def
NSLog(@"%@",[@"abcdef" substringToIndex:3]);////从0开始截取到第三个索引（不包括第三个索引对应的字符）
//结果：abc
NSLog(@"%@",[@"abcdef" substringWithRange:NSMakeRange(2, 3)]);
//结果：cde
NSString *str1=@"12.abcd.3a";
NSArray *array1=[str1 componentsSeparatedByString:@"."];//字符串分割
NSLog(@"%@",array1);
/*结果：
(
12,
abcd,
3a
)
*/
}
//其他操作
void test5(){
NSLog(@"%i",[@"12" intValue]);//类型转换
//结果：12
NSLog(@"%zi",[@"hello world,世界你好！" length]);//字符串长度注意不是字节数
//结果：17
NSLog(@"%c",[@"abc" characterAtIndex:0]);//取出制定位置的字符
//结果：a
const char *s=[@"abc" UTF8String];//转换为C语言字符串
NSLog(@"%s",s);
//结果：abc
}
int main(int argc, const char * argv[]) {
test1();
test2();
test3();
test4();
test5();
return 0;
} |
|
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