·常用属性和方法有：1、创建CGRect rect = CGRectMake(100, 200, 50, 50);UILabel *label = [[UILabel alloc] initWithFrame:rect];2、text //设置和读取文本内容,默认为nillabel.text = @”文本信息”; //设置内容NSLog(@”%@”, label.text); //读取内容3、textColor //设置文字颜色，默认为黑色lable.textColor = [UIColor redColor];4、font //设置字体大小，默认17label.font = [UIFont systemFontOfSize:20]; //⼀一般方法label.font = [UIFont boldSystemFontOfSize:20]; //加粗方法label.font = [UIFont fontWithName:@"Arial" size:16]; //指定字体的方法//还有⼀一种从外部导入字体的方法。5、textAlignment //设置标签文本对齐方式。label.textAlignment = NSTextAlignmentCenter; //还有NSTextAlignmentLeft、 NSTextAlignmentRight.6、numberOfLines //标签最多显示行数,如果为0则表示多行。label.numberOfLines = 2;7、enabled //只是决定了Label的绘制方式，将它设置为NO将会使文本变暗，表示它没有激活，这时向它设置颜色值是无效的。label.enable = NO;8、highlighted //是否高亮显示label.highlighted = YES;label.highlightedTextColor = [UIColor orangeColor]; //高亮显示时的文本颜色9、ShadowColor //设置阴影颜色 [label setShadowColor:[UIColor blackColor]];10、ShadowOffset //设置阴影偏移量[label setShadowOffset:CGSizeMake(-1, -1)];11、baselineAdjustment //如果adjustsFontSizeToFitWidth属性设置为YES，这个属性就来控制文本基线的行为。label.baselineAdjustment = UIBaselineAdjustmentNone;UIBaselineAdjustmentAlignBaselines = 0,默认，文本最上端与中线对齐。UIBaselineAdjustmentAlignCenters, 文本中线与label中线对齐。UIBaselineAdjustmentNone, 文本最低端与label中线对齐。12、Autoshrink //是否自动收缩Fixed Font Size 默认,如果Label宽度小于文字长度时时,文字大小不自动缩放minimumScaleFactor 设置最小收缩比例，如果Label宽度小于文字长度时，文字进行收缩，收缩超过比例后，停止收缩。minimumFontSize 设置最小收缩字号，如果Label宽度小于文字长度时，文字字号减小，低于设定字号后，不再减小。//6.0以后不再使用了。label.minimumScaleFactor = 0.5;13、adjustsLetterSpacingToFitWidth //改变字母之间的间距来适应Label大小myLabel.adjustsLetterSpacingToFitWidth = NO;14、 lineBreakMode //设置文字过长时的显示格式 label.lineBreakMode = NSLineBreakByCharWrapping;以字符为显示单位显示，后面部分省略不显示。label.lineBreakMode = NSLineBreakByClipping;剪切与文本宽度相同的内容长度，后半部分被删除。label.lineBreakMode = NSLineBreakByTruncatingHead;前面部分文字以……方式省略，显示尾部文字内容。label.lineBreakMode = NSLineBreakByTruncatingMiddle;中间的内容以……方式省略，显示头尾的文字内容。label.lineBreakMode = NSLineBreakByTruncatingTail;结尾部分的内容以……方式省略，显示头的文字内容。label.lineBreakMode = NSLineBreakByWordWrapping;以单词为显示单位显示，后面部分省略不显示。15、 adjustsFontSizeToFitWidth //设置字体大小适应label宽度 label.adjustsFontSizeToFitWidth = YES;16、attributedText：设置标签属性文本。NSString *text = @"first";NSMutableAttributedString *textLabelStr =[[NSMutableAttributedString alloc]initWithString:text];[textLabelStrsetAttributes:@{NSForegroundColorAttributeName :[UIColor lightGrayColor], NSFontAttributeName :[UIFont systemFontOfSize:17]} range:NSMakeRange(11,10)];label.attributedText = textLabelStr;17、竖排文字显示每个文字加一个换行符，这是最方便和简单的实现方式。label.text = @"请\n竖\n直\n方\n向\n排\n列";label.numberOfLines = [label.text length];18、计算UIlabel 随字体多行后的高度CGRect bounds = CGRectMake(0, 0, 200, 300);heightLabel = [myLabel textRectForBounds:boundslimitedToNumberOfLines:20]; //计算20行后的Label的FrameNSLog(@"%f",heightLabel.size.height);19、UILabel根据字数多少自动实现适应高度UILabel *msgLabel = [[UILabel alloc]initWithFrame:CGRectMake(15, 45, 0, 0)];msgLabel.backgroundColor = [UIColor lightTextColor];[msgLabel setNumberOfLines:0];msgLabel.lineBreakMode = UILineBreakModeWordWrap;msgLabel.font = [UIFont fontWithName:@"Arial" size:12];CGSize size = CGSizeMake(290, 1000);msgLabel.text = @"获取到的deviceToken，我们可以通过webservice服务提交给.net应用程序，这里我简单处理，直接打印出来，拷贝到.net应用环境中使用。";CGSize msgSie = [msgLabel.text sizeWithFont:fontsconstrainedToSize:size];[msgLabel setFrame:CGRectMake(15, 45, 290, msgSie.height)];20、渐变字体LabelUIColor *titleColor = [UIColor colorWithPatternImage:[UIImageimageNamed:@"btn.png"]];NSString *title = @"Setting";UILabel *titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 80, 44)];titleLabel.textColor = titleColor;titleLabel.text = title;titleLabel.font = [UIFont boldSystemFontOfSize:20];titleLabel.backgroundColor = [UIColor clearColor];[self.view addSubview:titleLabel];[titleLabel release];21、Label添加边框titleLabel.layer.borderColor = [[UIColor grayColor] CGColor];titleLabel.layer.borderWidth = 2;
在iOS中默认的UILabel中的文字在竖直方向上只能居中对齐，博主参考国外网站，从UILabel继承了一个新类，实现了居上对齐，居中对齐，居下对齐。具体如下：#import <UIKit/UIKit.h> typedef enum { VerticalAlignmentTop = 0, // default VerticalAlignmentMiddle, VerticalAlignmentBottom, } VerticalAlignment; @interface myUILabel : UILabel { @private VerticalAlignment _verticalAlignment; } @property (nonatomic) VerticalAlignment verticalAlignment; @end // // myUILabel.m // // // Created by yexiaozi_007 on 3/4/13. // Copyright (c) yexiaozi_007. All rights reserved. // #import "myUILabel.h" @implementation myUILabel @synthesize verticalAlignment = verticalAlignment_; -(id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { self.verticalAlignment = VerticalAlignmentMiddle; } return self; } -(void)setVerticalAlignment:(VerticalAlignment)verticalAlignment { verticalAlignment_ = verticalAlignment; [self setNeedsDisplay]; } -(CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines { CGRect textRect = [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines]; switch (self.verticalAlignment) { case VerticalAlignmentTop: textRect.origin.y = bounds.origin.y; break; case VerticalAlignmentBottom: textRect.origin.y = bounds.origin.y + bounds.size.height - textRect.size.height; break; case VerticalAlignmentMiddle: // Fall through. default: textRect.origin.y = bounds.origin.y + (bounds.size.height - textRect.size.height) / 2.0; } return textRect; } -(void)drawTextInRect:(CGRect)requestedRect { CGRect actualRect = [self textRectForBounds:requestedRect limitedToNumberOfLines:self.numberOfLines]; [super drawTextInRect:actualRect]; } @end 在使用时：lbl_mylabel = [[myUILabel alloc] initWithFrame:CGRectMake(20, 50, 150, 600)]; UIColor *color = [UIColor colorWithPatternImage:[UIImage imageNamed:@"halfTransparent.png"]];//使用半透明图片作为label的背景色 lbl_mylabel.backgroundColor = color; lbl_mylabel.textAlignment = UITextAlignmentLeft; lbl_mylabel.textColor = UIColor.whiteColor; lbl_mylabel.lineBreakMode = UILineBreakModeWordWrap; lbl_mylabel.numberOfLines = 0; [lbl_mylabel setVerticalAlignment:VerticalAlignmentTop]; [self addSubview:lbl_mylabel];
//学习内容 /* 1.控件 UIView UILabel UITextField UITextView UIButton 2.字体、大小、单位、颜色 */ UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 300, 260)]; label.text = @"Label Text Content, This is a text label things attribute";//默认为空 label.font = [UIFont systemFontOfSize:17];//默认使用系统的17 label.textColor = [UIColor orangeColor];//默认使用文本黑色 label.shadowColor = [UIColor lightGrayColor];//默认没有阴影 label.shadowOffset = CGSizeMake(1,0);//默认是一个向上的阴影(0,-1) label.textAlignment = NSTextAlignmentCenter;//默认是左对齐 label.lineBreakMode = NSLineBreakByTruncatingTail;//段落样式，默认是最后截断尾巴，用...代替 //富文本的基本数据类型，属性字符串。以此为基础，如果这个设置了相应的属性，则会忽略上面设置的属性，默认为空 NSString *string = label.text; const CGFloat fontSize = 16.0; NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:string]; NSUInteger length = [string length]; //设置字体 UIFont *baseFont = [UIFont systemFontOfSize:fontSize]; [attrString addAttribute:NSFontAttributeName value:baseFont range:NSMakeRange(0, length)];//设置所有的字体 UIFont *boldFont = [UIFont boldSystemFontOfSize:fontSize]; [attrString addAttribute:NSFontAttributeName value:boldFont range:[string rangeOfString:@"Text"]];//设置Text这四个字母的字体为粗体 //设置倾斜，需要导入coreText UIFont *italicFont = GetVariationOfFontWithTrait(baseFont, kCTFontTraitItalic); [attrString addAttribute:NSFontAttributeName value:italicFont range:[string rangeOfString:@"Label"]]; // 设置颜色 UIColor *color = [UIColor redColor]; [attrString addAttribute:NSForegroundColorAttributeName value:color range:[string rangeOfString:@"Content"]]; [attrString addAttribute:NSBackgroundColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"ent"]]; //可以对这些属性设置值 //字体名称有以下： // label.font = [UIFont fontWithName:@"Arial-BoldItalicMT" size:24]; [attrString addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Verdana-BoldItalic" size:18] range:[string rangeOfString:@"Label"]]; label.numberOfLines = 2; NSMutableParagraphStyle * style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy]; style.lineSpacing = 10;//增加行高 style.headIndent = 10;//头部缩进，相当于左padding style.tailIndent = -10;//相当于右padding style.lineHeightMultiple = 1.5;//行间距是多少倍 style.alignment = NSTextAlignmentLeft;//对齐方式 style.firstLineHeadIndent = 20;//首行头缩进 style.paragraphSpacing = 10;//段落后面的间距 style.paragraphSpacingBefore = 20;//段落之前的间距 [attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, length)]; [attrString addAttribute:NSKernAttributeName value:@2 range:NSMakeRange(0, length)];//字符间距 2pt [attrString addAttribute:NSStrokeColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"is"]];//设置文字描边颜色，需要和NSStrokeWidthAttributeName设置描边宽度，这样就能使文字空心 [attrString addAttribute:NSStrokeWidthAttributeName value:@2 range:[string rangeOfString:@"is"]];//空心字，文字边框描述 [attrString addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:[string rangeOfString:@"text"]];//下划线 [attrString addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleThick) range:[string rangeOfString:@"label"]];//厚的下划线 [attrString addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:[string rangeOfString:@"things"]];//删除线 [attrString addAttribute:NSStrikethroughColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"things"]];//删除线蓝色 label.attributedText = attrString; label.highlightedTextColor = [UIColor redColor];//设置文本高亮显示颜色，与highlighted一起使用。 label.highlighted = NO; //高亮状态是否打开 label.enabled = YES;//设置文字内容是否可变 label.userInteractionEnabled = YES;//设置标签是否忽略或移除用户交互。默认为NO label.baselineAdjustment = UIBaselineAdjustmentNone;//如果adjustsFontSizeToFitWidth属性设置为YES，这个属性就来控制文本基线的行为。 // UIBaselineAdjustmentAlignBaselines=0，默认，文本最上端与中线对齐。 // UIBaselineAdjustmentAlignCenters, 文本中线与label中线对齐。 // UIBaselineAdjustmentNone, 文本最低端与label中线对齐。; [self.view addSubview:label]; /* lineSpacing;来增加行距 paragraphSpacing; alignment; 对齐 firstLineHeadIndent; 段落开始的缩排像素 headIndent;可调整全部文字的缩排距离，可当作左边 padding 使用 tailIndent;可调整文字尾端的缩排距离。需要注意的是，这里指定的值可以当作文字显示的宽、而也可当作右边 padding 使用，依据输入的正负值而定： lineBreakMode; minimumLineHeight; maximumLineHeight; 而针对不同的字型与字号，我们可以透过指定最大与最小行距（maximumLineHeight 与 minimumLineHeight）来避免过高或过窄的状况发生。 baseWritingDirection; lineHeightMultiple; 想要调整行距，可以透过搭配使用 lineHeightMultiple 更改行距倍数 paragraphSpacingBefore; 而若是文章内容有分段落的话，也可以透过指定段落结尾距离（paragraphSpacing）以及段落开头距离//获取斜体 UIFont * GetVariationOfFontWithTrait(UIFont *baseFont, CTFontSymbolicTraits trait) { CGFloat fontSize = [baseFont pointSize]; CFStringRef baseFontName = (__bridge CFStringRef)[baseFont fontName]; CTFontRef baseCTFont = CTFontCreateWithName(baseFontName, fontSize, NULL); CTFontRef ctFont = CTFontCreateCopyWithSymbolicTraits(baseCTFont, 0, NULL, trait, trait); NSString *variantFontName = CFBridgingRelease(CTFontCopyName(ctFont, kCTFontPostScriptNameKey)); UIFont *variantFont = [UIFont fontWithName:variantFontName size:fontSize]; CFRelease(ctFont); CFRelease(baseCTFont); return variantFont; };
