UILabel的各种属性与方法的使用

 #import "LabelTestViewController.h"
 @implementation LabelTestViewController
 /*
 Accessing the Text Attributes
     text  property
     font  property
     textColor  property
     textAlignment  property
     lineBreakMode  property
     enabled  property
 Sizing the Label’s Text
     adjustsFontSizeToFitWidth  property
     baselineAdjustment  property
     minimumFontSize  property   无例
     numberOfLines  property
 Managing Highlight Values
     highlightedTextColor  property
     highlighted  property
 Drawing a Shadow
     shadowColor  property
     shadowOffset  property
 Drawing and Positioning Overrides
     – textRectForBounds:limitedToNumberOfLines: 无例
     – drawTextInRect:  无例
 Setting and Getting Attributes
     userInteractionEnabled  property
 */

 // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
 - (void)viewDidLoad {
     UILabel *label1 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 20.0, 200.0, 50.0)];
     UILabel *label2 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 80.0, 200.0, 50.0)];
     UILabel *label3 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 140.0, 200.0, 50.0)];
     UILabel *label4 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 200.0, 200.0, 50.0)];
     UILabel *label5 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 260.0, 200.0, 50.0)];
     UILabel *label6 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 320.0, 200.0, 50.0)];
     UILabel *label7 = [[UILabel alloc]initWithFrame:CGRectMake(50.0, 380.0, 200.0, 50.0)];

     //设置显示文字
     label1.text = @"label1";
     label2.text = @"label2";
     label3.text = @"label3--label3--label3--label3--label3--label3--label3--label3--label3--label3--label3--";
     label4.text = @"label4--label4--label4--label4--";
     label5.text = @"label5--label5--label5--label5--label5--label5--";
     label6.text = @"label6";
     label7.text = @"label7";

     //设置字体
     label1.font = [UIFont boldSystemFontOfSize:20];

     //设置文字颜色
     label1.textColor = [UIColor orangeColor];
     label2.textColor = [UIColor purpleColor];

     //设置文字位置
     label1.textAlignment = UITextAlignmentRight;
     label2.textAlignment = UITextAlignmentCenter;
     //设置字体大小适应label宽度
     label4.adjustsFontSizeToFitWidth = YES;

     //设置label的行数
     label5.numberOfLines = 2;

     //设置高亮
     label6.highlighted = YES;
     label6.highlightedTextColor = [UIColor orangeColor];

     //设置阴影
     label7.shadowColor = [UIColor redColor];
     label7.shadowOffset = CGSizeMake(1.0,1.0);

     //设置是否能与用户进行交互
     label7.userInteractionEnabled = YES;

     //设置label中的文字是否可变，默认值是YES
     label3.enabled = NO;

     //设置文字过长时的显示格式
     label3.lineBreakMode = UILineBreakModeMiddleTruncation;//截去中间
 //  typedef enum {
 //      UILineBreakModeWordWrap = 0,
 //      UILineBreakModeCharacterWrap,
 //      UILineBreakModeClip,//截去多余部分
 //      UILineBreakModeHeadTruncation,//截去头部
 //      UILineBreakModeTailTruncation,//截去尾部
 //      UILineBreakModeMiddleTruncation,//截去中间
 //  } UILineBreakMode;

     //如果adjustsFontSizeToFitWidth属性设置为YES，这个属性就来控制文本基线的行为
     label4.baselineAdjustment = UIBaselineAdjustmentNone;
 //  typedef enum {
 //      UIBaselineAdjustmentAlignBaselines,
 //      UIBaselineAdjustmentAlignCenters,
 //      UIBaselineAdjustmentNone,
 //  } UIBaselineAdjustment;