txtlbl.font = [UIFont boldSystemFontOfSize:14.0f];  
   txtlbl.numberOfLines = 0;  
NSString *str = @"        阿方决定设立科技特网络离开电视剧分w额两个大陆高科技了了不见了日i倒计时离开我说老师肯德基弗兰克萨江东父老将费德勒说阿方决定设立科技特网络离开电视剧分w额两个大陆高科技了了不见了日i倒计时离开我立科说老师肯德基弗兰克萨江东父老将费德勒说";
   CGSize size = [str sizeWithFont:txtlbl.font constrainedToSize:CGSizeMake(txtlbl.frame.size.width, MAXFLOAT) lineBreakMode:NSLineBreakByWordWrapping];
   //根据计算结果重新设置txtlbl的尺寸
   [txtlbl setFrame:CGRectMake(7, 0, 310, size.height)];
   txtlbl.text = str;
//objectc/8373