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-instance

UILabel 设置过长文本中间为省略号

label.lineBreakMode =NSLineBreakByTruncatingMiddle;

参考：iOS组件之UILabel

iOS 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;

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