iOS开发之一些字符串常用的代码

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

NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
if ([astring01 compare: astring02]!=NSOrderedSame )
{
NSLog(@"not equal");
}

NSString *urlString = [urlInput stringValue];

if (!urlString) {

NSLog( @”NO INPUT.” );

} else {

if ([urlString length] == 0 ) {

NSLog( @”NO INPUT.” );

} else {

}

}
}