NSString 演示（无注释）

来源：互联网发布：纽约攻略知乎编辑：程序博客网时间：2024/06/13 07:20

#import <Foundation/Foundation.h>

#import <objc/objc.h>

#import <objc/objc-runtime.h>

void stringTest(void)

{

NSString *str = @"hello world";//常量字符串

NSString *str1 = [[NSString alloc] init];

NSString *str2 = [[NSString alloc] initWithFormat:@"%s//www.mobiletrain.org/pic/%d.png", "http:", 1000];

NSString *str3 = [[NSString alloc] initWithString:str2];

NSString *str4 = [[NSString alloc] initWithUTF8String:"asfdhjashf"];

NSString *str1 = [NSStringstringWithFormat:@"%s:%d", "asdf", 10];

NSString *str2 = [NSStringstringWithContentsOfFile:@"/etc/passwd"encoding:NSUTF8StringEncoding error:nil];

NSLog(@"%@", str1);

}

void stringTest2(void)

{

//NSLog(@"c len= %u, ns len=%d", strlen("中国"), [@"中国" length]);

unichar c = [@"中23"characterAtIndex:0];//取出指定位置的字符

NSLog(@"%d", c);

NSString *str = @"abcdef";

unichar buf[100] = {0};

[str getCharacters:(unichar *)buf];

NSLog(@"%c, %c, %c, %c, %c, %c", buf[0],buf[1], buf[2], buf[3],

buf[4], buf[5]);

}

void stringTest3(void)

{

NSString *str =@"abcdefghijklmnopqrstuvwxyz";

NSLog(@"%@", [strsubstringFromIndex:8]);

NSLog(@"%@", [strsubstringWithRange:NSMakeRange(5,10)]);

}

void stringTest4(void)

{

NSString *str = @"abcde";

NSLog(@"%ld", [strcompare:@"Abcde"options:NSCaseInsensitiveSearch]);

}

void stringTest5(void)

{

NSRange r = [@"abcdesf"rangeOfString:@"CDE"options:NSCaseInsensitiveSearch];//rangeOfString前面的参数是要被搜索的字符串，后面的是要搜索的字符

if (r.location ==NSNotFound) {

NSLog(@"not found");

} else

NSLog(@"%lu, %d", (unsignedlong)r.location, (int)r.length);

}

void stringTest6()

{

NSLog(@"%d, %f", [@"123"intValue], [@"12.35"floatValue]);

NSLog(@"%@, %@, %@", [@"abcDEF"lowercaseString],

[@"abcDEF"uppercaseString], [@"ansdfDEF"capitalizedString]);

NSLog(@"%s", [@"ajhsdfhj"cStringUsingEncoding:NSUTF8StringEncoding]);

}

void stringTest7()

{

NSString *str =@"zhangsan sdh zhangsan askjdfjk zhangsan ashdh";

NSString *res = [strstringByReplacingOccurrencesOfString:@"zhangsan"withString:@"lisi"options:NSCaseInsensitiveSearch range:NSMakeRange(0, str.length)];

NSLog(@"%@\n%@", str, res);

}

void stringTest8()

{

NSMutableString *str = [[NSMutableStringalloc] initWithCapacity:0];

[str appendString:@"hello"];

[str insertString:@"yworld"atIndex:str.length];

[str appendFormat:@"%s","!"];

[str deleteCharactersInRange:NSMakeRange(0,6)];

NSLog(@"%@", str);

}

int main(int argc, const char * argv[])

{

@autoreleasepool {

stringTest3();

}

return 0;

}

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