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;

 

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：

1    myUILabel.h 2      3 #import 
       
         4     typedef enum 5     { 6         VerticalAlignmentTop = 0, // default 7         VerticalAlignmentMiddle, 8         VerticalAlignmentBottom, 9     } VerticalAlignment;10     @interface myUILabel : UILabel11     {12     @private13         VerticalAlignment _verticalAlignment;14     }15     16     @property (nonatomic) VerticalAlignment verticalAlignment;17     18     @end19     @implementation myUILabel20     @synthesize verticalAlignment = verticalAlignment_;21     22     - (id)initWithFrame:(CGRect)frame {23         if (self = [super initWithFrame:frame]) {24             self.verticalAlignment = VerticalAlignmentMiddle;25         }26         return self;27     }28     29     - (void)setVerticalAlignment:(VerticalAlignment)verticalAlignment {30         verticalAlignment_ = verticalAlignment;31         [self setNeedsDisplay];32     }33     34     - (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines {35         CGRect textRect = [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines];36         switch (self.verticalAlignment) {37             case VerticalAlignmentTop:38                 textRect.origin.y = bounds.origin.y;39                 break;40             case VerticalAlignmentBottom:41                 textRect.origin.y = bounds.origin.y + bounds.size.height - textRect.size.height;42                 break;43             case VerticalAlignmentMiddle:44                 // Fall through.45             default:46                 textRect.origin.y = bounds.origin.y + (bounds.size.height - textRect.size.height) / 2.0;47         }48         return textRect;49     }  50     51     -(void)drawTextInRect:(CGRect)requestedRect {  52         CGRect actualRect = [self textRectForBounds:requestedRect limitedToNumberOfLines:self.numberOfLines];  53         [super drawTextInRect:actualRect];  54     }  55     56     57     @end
       

 

 

 

在使用时：

 

1 lbl_mylabel = [[myUILabel alloc] initWithFrame:CGRectMake(20, 50, 150, 600)];  2 UIColor *color = [UIColor colorWithPatternImage:[UIImage imageNamed:@"halfTransparent.png"]];//使用半透明图片作为label的背景色  3 lbl_mylabel.backgroundColor = color;  4 lbl_mylabel.textAlignment = UITextAlignmentLeft;  5 lbl_mylabel.textColor = UIColor.whiteColor;  6 lbl_mylabel.lineBreakMode = UILineBreakModeWordWrap;  7 lbl_mylabel.numberOfLines = 0;  8 [lbl_mylabel setVerticalAlignment:VerticalAlignmentTop];  9 [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-instance

 

UILabel 设置过长文本中间为省略号

 label.lineBreakMode = NSLineBreakByTruncatingMiddle;

参考：

 

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;