iPhone获取字符串像素长度
2011-07-07CGSize sizeOfStr = [str sizeWithFont:[UIFont systemFontOfSize:29] constrainedToSize:CGSizeMake(240.0f, 480.0f) lineBreakMode:UILineBreakModeCharacterWrap];
CGSize sizeOfStr = [str sizeWithFont:[UIFont systemFontOfSize:29] constrainedToSize:CGSizeMake(240.0f, 480.0f) lineBreakMode:UILineBreakModeCharacterWrap];