//UILable的大小自适应实例

    UILabel *myLable = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];//设定位置与大小

    [myLable setFont:[UIFont fontWithName:@"Helvetica" size:20.0]];//格式

    [myLable setNumberOfLines:];//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(., 1.0);//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:];

    //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:/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 = ;  

    //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];