OC中的NSMutableString案例讲解

来源：互联网发布：json转form 编辑：程序博客网时间：2024/04/28 03:32

//可变字符串的操作

//NSMutableString是NSString子类，所以能使用NSString的所有非私有方法和属性

//1.初始化

NSMutableString *str1 = [NSMutableStringstringWithString:@"Hello World!!!"];

NSLog(@"使用NSString类中的stringWithString方法打印:%@",str1);

预期结果：2015-07-30 15:29:26.217 myOC[22747:165634] 使用NSString类中的stringWithString方法打印:Hello World!!!

NSMutableString *str2 = [NSMutableStringstringWithFormat:@"Hello World!!!"];

NSLog(@"使用NSString类中的stringWithFormat方法打印:%@",str2);

预期结果：2015-07-30 15:29:26.219 myOC[22747:165634] 使用NSString类中的stringWithFormat方法打印:Hello World!!!

NSMutableString *str3 = [NSMutableStringstringWithContentsOfURL:[NSURLURLWithString:@"http://baidu.com"]encoding:NSUTF8StringEncodingerror:nil];

NSLog(@"使用NSString类中的stringWithContentsOfURL方法打印:%@",str3);

预期结果：

2015-07-30 15:29:26.683 myOC[22747:165634] 使用NSString类中的stringWithContentsOfURL方法打印:<html>

<meta http-equiv="refresh" content="0;url=http://www.baidu.com/">

</html>

NSMutableString *mString = [NSMutableStringstringWithCapacity:8];

//开始开辟8个空间内存，超过8个字符是自动增加内存空间

[mStringappendFormat:@"Hello"];

//使用stringWithCapacity后要用appendFormat方法最佳

//增加:

[mStringappendFormat:@"__World!"];

NSLog(@"增加后字符串为: %@",mString);

预期结果：2015-07-30 15:29:26.683 myOC[22747:165634] 增加后字符串为: Hello__World!

//删除

NSRange range = [mStringrangeOfString:@"World"];

[mStringdeleteCharactersInRange:range];

NSLog(@"删除后字符串为: %@",mString);

预期结果：2015-07-30 15:29:26.683 myOC[22747:165634] 删除后字符串为: Hello__!

//替换

range = [mStringrangeOfString:@"__"];

[mString replaceCharactersInRange:rangewithString:@"**"];

NSLog(@"替换后字符串为:%@",mString);

预期结果：2015-07-30 15:29:26.684 myOC[22747:165634] 替换后字符串为:Hello**!

[mString replaceOccurrencesOfString:@"l"withString:@"OO"options:NSCaseInsensitiveSearchrange:NSMakeRange(0, mString.length)];

//以上方法是替换可变数组中的所有l字符串

//实例操作1:

//已知字符串"hlo world",将"el"插入到“h”和“l”之间，再将“world”替换为"bokan";

NSMutableString *content = [NSMutableStringstringWithString:@"hlo world"];

NSRange index = [contentrangeOfString:@"l"];

[contentinsertString:@"el"atIndex:index.location];

index = [contentrangeOfString:@"world"];

[content replaceCharactersInRange:indexwithString:@"bokan"];

NSLog(@"content输出结果:%@",content);

预期结果：2015-07-30 15:29:26.684 myOC[22747:165634] content输出结果:hello bokan

//实例操作2:

//将字符串“I love coding!!”使用NSRange删除感叹号

NSMutableString *content2 = [NSMutableStringstringWithString:@"I love coding!!"];

NSRange index2 = [content2rangeOfString:@"!!"];

[content2deleteCharactersInRange:index2];

NSLog(@"content2输出结果:%@",content2);

预期结果：2015-07-30 15:29:26.684 myOC[22747:165634] content2输出结果:I love coding

//将字符串“I love!!! co!!ding!!”使用NSRange删除多余的感叹号，保留最后一个感叹号

NSMutableString *content3 = [NSMutableStringstringWithFormat:@"I love!!! co!!ding!!"];

NSRange index3 = [content3rangeOfString:@"!"];

while (index3.location !=NSNotFound) {

[content3deleteCharactersInRange:index3];

index3 = [content3rangeOfString:@"!"];

}

[content3appendString:@"!"];

NSLog(@"content3输出结果:%@",content3);

预期结果：2015-07-30 15:29:26.685 myOC[22747:165634] content3输出结果:I love coding!

//实例操作3:

//123-456-789-000 转 1234567890000

NSMutableString *content4 = [NSMutableStringstringWithString:@"123-456-789-000"];

[content4 replaceOccurrencesOfString:@"-"withString:@""options:NSCaseInsensitiveSearchrange:NSMakeRange(0, content4.length)];

NSLog(@"content4输出结果:%@",content4);

预期结果：2015-07-30 15:29:26.685 myOC[22747:165634] content4输出结果:123456789000

输出结果如下：

2015-07-30 15:29:26.217 myOC[22747:165634]使用NSString类中的stringWithString方法打印:Hello World!!!

2015-07-30 15:29:26.219 myOC[22747:165634]使用NSString类中的stringWithFormat方法打印:Hello World!!!

2015-07-30 15:29:26.683 myOC[22747:165634]使用NSString类中的stringWithContentsOfURL方法打印:<html>

<meta http-equiv="refresh" content="0;url=http://www.baidu.com/">

</html>

2015-07-30 15:29:26.683 myOC[22747:165634]增加后字符串为: Hello__World!

2015-07-30 15:29:26.683 myOC[22747:165634]删除后字符串为: Hello__!

2015-07-30 15:29:26.684 myOC[22747:165634]替换后字符串为:Hello**!

2015-07-30 15:29:26.684 myOC[22747:165634] content输出结果:hello bokan

2015-07-30 15:29:26.684 myOC[22747:165634] content2输出结果:I love coding

2015-07-30 15:29:26.685 myOC[22747:165634] content3输出结果:I love coding!

2015-07-30 15:29:26.685 myOC[22747:165634] content4输出结果:123456789000

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