//UILable的大小自适应实例      UILabel *myLable = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 2, 2)];//设定位置与大小      [myLable setFont:[UIFont fontWithName:@"Helvetica" size:20.0]];//格式      [myLable setNumberOfLines:0];//行数，只有设为0才能自适应      [myLable setBackgroundColor:[UIColor clearColor]];//背景色      myLable.shadowColor = [UIColor darkGrayColor];//阴影颜色      myLable.shadowOffset = CGSizeMake(1., 1.0);//阴影大小            NSString *text = @"abcdefghijklmnopqrstuvwxyz";      UIFont *font = [UIFont fontWithName:@"Helvetica" size:20.0];      CGSize size = [text sizeWithFont:font constrainedToSize:CGSizeMake(175.0f, 2000.0f) lineBreakMode:UILineBreakModeWordWrap];      CGRect rect = myLable.frame;      rect.size = size;      [myLable setFrame:rect];      [myLable setText:text];      myLable.shadowColor = [UIColor darkGrayColor];//阴影颜色      myLable.shadowOffset =  CGSizeMake(2.0, 2.0);//阴影大小      [self.view addSubview:myLable];      [myLable release];            //UILable的基本用法      UILabel *lbl1 = [[UILabel alloc] initWithFrame:CGRectMake(50.0, 40.0, 200.0, 30.0)];      UILabel *lbl2 = [[UILabel alloc] initWithFrame:CGRectMake(50.0, 80.0, 200.0, 50.0)];      UILabel *lbl3 = [[UILabel alloc] initWithFrame:CGRectMake(50.0, 140.0, 200.0, 50.0)];      UILabel *lbl4 = [[UILabel alloc] initWithFrame:CGRectMake(50.0, 200.0, 200.0, 50.0)];      UILabel *lbl5 = [[UILabel alloc] initWithFrame:CGRectMake(50.0, 260.0, 200.0, 50.0)];      UILabel *lbl6 = [[UILabel alloc] initWithFrame:CGRectMake(50.0, 320.0, 200.0, 50.0)];      UILabel *lbl7 = [[UILabel alloc] initWithFrame:CGRectMake(50.0, 380.0, 200.0, 50.0)];            //设置显示文字      lbl1.text = @"lable1";      lbl2.text = @"lable2";      lbl3.text = @"lable3--lable3--lable3--lable3--lable3--lable3--lable3--lable3--lable3--lable3--lable3--11个";      lbl4.text = @"lable4--lable4--lable4--lable4--4个";      lbl5.text = @"lable5--lable5--lable5--lable5--lable5--lable5--6个";      lbl6.text = @"lable6";      lbl7.text = @"lable7";            //设置字体：粗体，正常的是SystemFontOfSize      lbl1.font = [UIFont boldSystemFontOfSize:20];      //设置文字颜色      lbl1.textColor = [UIColor orangeColor];      lbl2.textColor = [UIColor purpleColor];      //设置背景颜色      lbl1.backgroundColor = [UIColor clearColor];      lbl2.backgroundColor = [UIColor colorWithRed:0.5f green:30/255.0f blue:0.3f alpha:0.5f];      //设置字体位置      lbl1.textAlignment = UITextAlignmentRight;      lbl2.textAlignment = UITextAlignmentCenter;      //设置字体的小适应lable的宽度      lbl4.adjustsFontSizeToFitWidth = YES;      //设置lable 的行数      lbl5.numberOfLines = 2;            //设置高亮      lbl6.highlighted = YES;      lbl6.highlightedTextColor = [UIColor orangeColor];      //设置阴影      lbl7.shadowColor = [UIColor redColor];      lbl7.shadowOffset = CGSizeMake(1.0, 1.0);            //设置是否能与用户进行交互      lbl7.userInteractionEnabled = YES;      //设置lable中文字是否可变，默认为YES；      lbl3.enabled = NO;      //设置lable中文字过长时的显示格式      lbl3.lineBreakMode = UILineBreakModeMiddleTruncation; //截去中间  //    typedef enum{  //        UILineBreakModeWordWrap = 0,  //        UILineBreakModeCharacterWrap,  //        UILineBreakModeClip,//截去多余部分  //        UILineBreakModeHeadTruncation,//截取头部  //        UILineBreakModeTailTruncation,//截去尾部  //        UILineBreakModeMiddleTruncation,//截去中间  //    }UILineBreakMode;            //如果adjustsFontSizeToFitWidth属性设置为YES，这个属性就用来控制文本基线的行为      lbl4.baselineAdjustment = UIBaselineAdjustmentNone;      [self.view addSubview:lbl1];      [self.view addSubview:lbl2];      [self.view addSubview:lbl3];      [self.view addSubview:lbl4];      [self.view addSubview:lbl5];      [self.view addSubview:lbl6];      [self.view addSubview:lbl7];            [lbl1 release];      [lbl2 release];      [lbl3 release];      [lbl4 release];      [lbl5 release];      [lbl6 release];      [lbl7 release];