iOS开发之一些字符串常用的代码

1、判断字符串是否相等使用isEqualToString：

NSString
*
astring01
=

@"
This is a String!
"
;
NSString
*
astring02
=

@"
This is a String!
"
;
BOOL result
=
[astring01 isEqualToString:astring02];
NSLog(
@"
result:%d
"
,result);

2、判断字符不相等：

NSString
*
astring01
=

@"
This is a String!
"
;
NSString
*
astring02
=

@"
This is a String!
"
;

if
([astring01 compare: astring02]
!=
NSOrderedSame )
{
NSLog(
@"
not equal
"
);
}

3、判断字符串是否为空。

NSString
*
urlString
=
[urlInput stringValue];

if
(
!
urlString) {

NSLog( @”NO INPUT.” );

}
else
{

if
([urlString length]
==

) {

NSLog( @”NO INPUT.” );

}
else
{

}

}
}

原文链接：
http://www.cnblogs.com/zhuqil/archive/2011/08/03/2126524.html