UILabel 详解
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UILabel 多行文字自动换行 (自动折行)
1.UIView *footerView = [[UIView alloc] initWithFrame:CGRectMake(10, 100, 300, 180)]; 2. UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 300, 150)]; 3. label.text = @"where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you? where are you?"; 4. //清空背景颜色 5. label.backgroundColor = [UIColor clearColor]; 6. //设置字体颜色为白色 7. label.textColor = [UIColor whiteColor]; 8. //文字居中显示 9. label.textAlignment = UITextAlignmentCenter; 10. //自动折行设置 11. label.lineBreakMode = UILineBreakModeWordWrap; 12. label.numberOfLines = 0;
iOS的UILabel设置居上对齐,居中对齐,居下对齐
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:
- //
- // myUILabel.h
- //
- //
- // Created by yexiaozi_007 on 3/4/13.
- // Copyright (c) 2013 yexiaozi_007. All rights reserved.
- //
- #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) 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
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];
ios UILabel 变量名不能为title
-[UILabel copyWithZone:]: unrecognized selector sent to instance
遇到了这样一个错误,找了半天没找到是什么错误,于是,Google搜索,打开第一个链接http://stackoverflow.com/questions/10784207/uilabel-copywithzone-unrecognized-selector-sent-to-instanceUILabel 设置过长文本中间为省略号label.lineBreakMode = NSLineBreakByTruncatingMiddle;
参考:iOS组件之UILabeliOS UILabel详解http://blog.csdn.net/zhaopenghhhhhh/article/details/16331041·UILable是iPhone界面最基本的控件,主要用来显示文本信息。·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;
- NSString *textStr = @"iPhone规定:任何应用想访问麦克风,必须被授权麦克风服务。请进入“设置”->“隐私”->“麦克风”中打开QQ空间的麦克风服务。";
- UIFont *textFont = [UIFont systemFontOfSize:14];
- CGSize textSize = [textStr sizeWithFont:textFont
- constrainedToSize:CGSizeMake(bounds.size.width - 40, QZONE_SCREEN_HEIGHT)];;
- UILabel *openMicPrivilegeTipsLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 20, textSize.width, textSize.height)];
- openMicPrivilegeTipsLabel.textColor = DefaultDescriptionText2ColorInDefaultTheme;
- openMicPrivilegeTipsLabel.text = textStr;
- openMicPrivilegeTipsLabel.backgroundColor = [UIColor clearColor];
- openMicPrivilegeTipsLabel.textAlignment = UITextAlignmentLeft;
- openMicPrivilegeTipsLabel.font = [UIFont systemFontOfSize:14];
- openMicPrivilegeTipsLabel.numberOfLines = 0;
- // 调整行间距
- NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:textStr];
- NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
- [paragraphStyle setLineSpacing:6];
- [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [textStr length])];
- openMicPrivilegeTipsLabel.attributedText = attributedString;
- [_tipsBG addSubview:openMicPrivilegeTipsLabel];
- [openMicPrivilegeTipsLabel sizeToFit];
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