UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(20, 40, 280, 80)];  //創(chuàng)建UILabel
label.backgroundColor = [UIColor grayColor];        //設(shè)置背景色
label.tag = 12;    //設(shè)置tag
label.text = @"Hello World";   //設(shè)置內(nèi)容
label.font = [UIFont fontWithName:@"Arial" size:30];   //設(shè)置內(nèi)容字體和字體大小
label.adjustsFontSizeToFitWidth = YES;    //文本自適應(yīng)大小 只會(huì)變小 當(dāng)numberOfLines為1時(shí)才有效
label.minimumFontSize = 12;    //文本自適應(yīng)縮小的最小字體大小 默認(rèn)為 0.0 上面要YES
label.textColor = [UIColor blueColor];    //文本顏色
label.numberOfLines = 2;   //文本最多行數(shù)，為0時(shí)沒有最大行數(shù)限制
label.highlighted = YES;      //文本高亮
label.enabled = YES;    //文本是否可變
label.backgroundColor = [UIColor clearColor];   //設(shè)置label的背景色透明
label.shadowColor = [UIColor grayColor];   //文本陰影顏色
label.shadowOffset = CGSizeMake(1.0, 1.0);    //陰影偏向 第一個(gè)橫向 >0 向右 < 0向左 第二個(gè)縱向  >0 向下 < 0向上
label.userInteractionEnabled = YES;    //是否與用戶交互
label.lineBreakMode = UILineBreakModeTailTruncation;     //文本超出label邊界文本的截取方式
typedef enum { 
         UILineBreakModeWordWrap = 0,    以空格為邊界,保留整個(gè)單詞,默認(rèn)方式      
         UILineBreakModeCharacterWrap,   保留整個(gè)字符 
         UILineBreakModeClip,            到邊界為止
         UILineBreakModeHeadTruncation,  省略開始，以....代替
         UILineBreakModeTailTruncation,  省略結(jié)尾，以....代替
         UILineBreakModeMiddleTruncation,省略中間，以....代替 
} UILineBreakMode;
label.baselineAdjustment = UIBaselineAdjustmentNone;   //baselineAdjustment這個(gè)值控制文本的基線位置，只有l(wèi)abel.adjustsFontSizeToFitWidth = YES;時(shí)有效自適應(yīng)大小要有效 label.numberOfLines為1
typedef enum {
         UIBaselineAdjustmentAlignBaselines = 0, 默認(rèn)設(shè)置文本最上端與label中線對(duì)齊
         UIBaselineAdjustmentAlignCenters,  文本中線與label中線對(duì)齊
         UIBaselineAdjustmentNone,          文本最低端label中線對(duì)齊
} UIBaselineAdjustment;
label.textAlignment = UITextAlignmentCenter;     //設(shè)置文本對(duì)齊方式 中間對(duì)齊
typedef enum {
         UITextAlignmentLeft = 0, 左對(duì)齊默認(rèn)方式
         UITextAlignmentCenter,   中間對(duì)其
         UITextAlignmentRight,    右對(duì)齊
} UITextAlignment;
[self.window addSubview:label];    //把label加到當(dāng)前窗口上
[label release];     //釋放掉label

UILabel自適應(yīng)高度和自動(dòng)換行

UILabel *label1 = [[UILabel alloc] initWithFrame:CGRectMake(0,0,0,0)];     //初始化label 
[label setNumberOfLines:0];      //設(shè)置自動(dòng)行數(shù)與字符換行  
label.lineBreakMode = UILineBreakModeWordWrap;   
NSString *s = @"這是一個(gè)測(cè)試！！！adsfsaf時(shí)發(fā)生發(fā)勿忘我勿忘我勿忘我勿忘我勿忘我阿阿阿阿阿阿阿阿阿阿阿阿阿啊00000000阿什頓。。。";                                                                   // 測(cè)試字串
UIFont *font = [UIFont fontWithName:@"Arial" size:12];    
 
CGSize size = CGSizeMake(320,2000);     //設(shè)置一個(gè)行高上限  
 
CGSize labelsize = [s sizeWithFont:font constrainedToSize:size lineBreakMode:UILineBreakModeWordWrap]; //計(jì)算實(shí)際frame大小，并將label的frame變成實(shí)際大小 
label1.frame = CGRectMake(0, 0, labelsize.width, labelsize.height);