nsstring

I need to convert two numbers to string in Objective-C. One is a long number and the other is a float. I searched on the internet for a solution and everyone uses stringWithFormat: but I can't make it work. I try NSString *myString = [NSString stringWithFormat: @"%f", floatValue] for 12345678.1234 and get "12345678.00000" as output and NSString *myString = [NSString stringWithFormat: @"%d", longValue] Can somebody show me how to use stringWithFormat: correctly? This article discusses how to use various formatting strings to convert numbers/objects into NSString instances: String Programming

I would like to put a character limit on a UITextField but don't know how. I want it to have a maximum of 16 characters in it. How do I do this. - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSUInteger newLength = [textField.text length] + [string length] - range.length; return (newLength > 12) ? NO : YES; } 来源： https://stackoverflow.com/questions/5760150/how-to-put-a-character-limit-on-a-uitextfield

I have a UITableView (Grouped!) and need to calculate the height of two styles of cells: UITableViewCellStyleDefault and UITableViewCellStyleValue2 . This is how I do it for UITableViewCellStyleDefault : CGSize textSize = {300.f, 200000.0f}; CGSize size = [myTextString1 sizeWithFont:[UIFont systemFontOfSize:14.0f] constrainedToSize:textSize lineBreakMode:UILineBreakModeWordWrap]; size.height += 30.0f; result = MAX(size.height, 44.0f); And for UITableViewCellStyleValue2 : CGSize textSize = {207.f, 200000.0f}; CGSize size = [myTextString2 sizeWithFont:[UIFont systemFontOfSize:14.0f]

I know NSString has methods that determine the frame size for it, using NSString UIKit Additions, sizeWithFont...... How about the other way around? I mean if I have a fixed frame size, how do I know how many characters or words for a NSString that can fit into it? If I know this, I can cut off the NSString easily. thanks It might not be the most elegant solution, but you could do something like this: - (NSString *)string:(NSString *)sourceString reducedToWidth:(CGFloat)width withFont:(UIFont *)font { if ([sourceString sizeWithFont:font].width <= width) return sourceString; NSMutableString

I was playing with the respondsToSelector method in Objective-C on MacOS-X 10.6.7 and Xcode 4.0.2, to identify if an object would respond to certain messages. According to the manuals, NSString should not respond to appendString: while NSMutableString should. Here's the piece of code which tests it: int main (int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; NSString *myString = [[NSString alloc] init]; if ([myString respondsToSelector:@selector(appendString:)]) { NSLog(@"myString responds to appendString:"); } else { NSLog(@"myString doesn't respond

I have a NSString with some html tags, how can I search for tag and get the content of url? I'm not sure if I must use Hpple or a simple Regex expression. In both cases can I have some example? One way to do this is using NSScanner . See this example: NSString *url = nil; NSString *htmlString = ... NSScanner *theScanner = [NSScanner scannerWithString:htmlString]; // find start of IMG tag [theScanner scanUpToString:@"<img" intoString:nil]; if (![theScanner isAtEnd]) { [theScanner scanUpToString:@"src" intoString:nil]; NSCharacterSet *charset = [NSCharacterSet characterSetWithCharactersInString: