常用属性和方法有:
1. 创建
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| CGRect rect = CGRectMake(100, 200, 50, 50); UILabel *label = [[UILabel alloc] initWithFrame:rect];
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2. text //设置和读取文本内容,默认为nil
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| label.text = @"文本信息"; NSLog(@"%@", label.text);
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3. textColor //设置文字颜色,默认为黑色
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| lable.textColor = [UIColor redColor];
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4. font //设置字体大小,默认17
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| label.font = [UIFont systemFontOfSize:20]; label.font = [UIFont boldSystemFontOfSize:20]; label.font = [UIFont fontWithName:@"Arial" size:16]; 字体的方法
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5. textAlignment //设置标签文本对齐方式。
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| label.textAlignment = NSTextAlignmentCenter; NSTextAlignmentLeft、 NSTextAlignmentRight.
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6. numberOfLines //标签最多显示行数,如果为0则表示多行。
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| label.numberOfLines = 2;
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7. enabled //只是决定了Label的绘制方式,将它设置
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| 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;
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8. highlighted //是否高亮显示
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| label.highlighted = YES; label.highlightedTextColor = [UIColor orangeColor];
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9. ShadowColor //设置阴影颜色
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| [label setShadowColor:[UIColor blackColor]];
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10. ShadowOffset //设置阴影偏移量
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| [label setShadowOffset:CGSizeMake(-1, -1)];
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11. baselineAdjustment //如果adjustsFontSizeToFitWidth属性设
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| label.baselineAdjustment = UIBaselineAdjustmentNone; UIBaselineAdjustmentAlignBaselines = 0, UIBaselineAdjustmentAlignCenters, UIBaselineAdjustmentNone,
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12. Autoshrink //是否自动收缩
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| Fixed Font Size minimumScaleFactor minimumFontSize label.minimumScaleFactor = 0.5;
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13. adjustsLetterSpacingToFitWidth //改变字母之间的间距来适应Label大小
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| myLabel.adjustsLetterSpacingToFitWidth = NO;
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14. lineBreakMode //设置文字过长时的显示格式
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| label.lineBreakMode = NSLineBreakByCharWrapping; label.lineBreakMode = NSLineBreakByClipping; label.lineBreakMode = NSLineBreakByTruncatingHead; label.lineBreakMode = NSLineBreakByTruncatingMiddle; label.lineBreakMode = NSLineBreakByTruncatingTail; label.lineBreakMode = NSLineBreakByWordWrapping;
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15. adjustsFontSizeToFitWidth //设置字体大小适应label宽度
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| label.adjustsFontSizeToFitWidth = YES;
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16. attributedText://设置标签属性文本。
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| NSString *text = @"first"; NSMutableAttributedString *textLabelStr = [[NSMutableAttributedString alloc] initWithString:text]; [textLabelStr setAttributes:@{NSForegroundColorAttributeName : [UIColor lightGrayColor], NSFontAttributeName : [UIFont systemFontOfSize:17]} range:NSMakeRange(11, 10)]; label.attributedText = textLabelStr;
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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。
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| label.text = @"请\n竖\n直\n方\n向\n排\n列"; label.numberOfLines = [label.text length];
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18. 计算UIlabel 随字体多行后的高度
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| CGRect bounds = CGRectMake(0, 0, 200, 300); heightLabel = [myLabel textRectForBounds:bounds limitedToNumberOfLines:20]; NSLog(@"%f",heightLabel.size.height);
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19. UILabel根据字数多少自动实现适应高度
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| 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:fonts constrainedToSize:size]; [msgLabel setFrame:CGRectMake(15, 45, 290, msgSie.height)];
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20. 渐变字体Label
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| UIColor *titleColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"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];
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21. Label添加边框
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| titleLabel.layer.borderColor = [[UIColor grayColor] CGColor];
titleLabel.layer.borderWidth = 2;
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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:
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| #import <UIKit/UIKit.h> typedef enum { VerticalAlignmentTop = 0, // default VerticalAlignmentMiddle, VerticalAlignmentBottom, } VerticalAlignment; @interface myUILabel : UILabel { @private VerticalAlignment _verticalAlignment; }
@property (nonatomic) VerticalAlignment verticalAlignment;
@end
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| // // myUILabel.m // // // Created by yexiaozi_007 on 3/4/13. // Copyright (c) 2013 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
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在使用时:
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| 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];
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学习内容
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| /* 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
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| //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];
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| //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
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| //设置倾斜,需要导入coreText UIFont *italicFont = GetVariationOfFontWithTrait(baseFont, kCTFontTraitItalic); [attrString addAttribute:NSFontAttributeName value:italicFont range:[string rangeOfString:@"Label"]];
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| // 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"]];
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| //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];
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| /* 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
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| //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; };
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