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常用代码整理： Xcode6,引入viewController代码： 1. 在Appdelegate先引入ViewController头文件 2. ViewController vc =(ViewController alloc)init； Self.window.rootViewController = vc; 然后vc就代表ViewController对象，就可以调用其属性和方法了。一般用通知来取代上面的写法： //发送通知 [[[[NSNotificationCenter defaultCenter]] postNotificationName:通知名object::nil]; //接受通知 //IB创建的对象调用initWithCoder要复写方法； -(instancetype) initWithCoder(NSCoder*)coder{ self = [super initWithCoder:coder]; if(self){ [[ NSNotificationCenter defaultCenter]addObserver:self selector:@selector(method)name:@”….”object:nil ]; } return self; } UILabel 多行文字自动换行（自动折行） UIView *footerView = [[UIView alloc] initWithFrame:CGRectMake(10, 100, 300, 180)]; UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 300, 150)]; 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?"; //清空背景颜色 label.backgroundColor = [UIColor clearColor]; //设置字体颜色为白色 label.textColor = [UIColor whiteColor]; //文字居中显示 label.textAlignment = UITextAlignmentCenter; //自动折行设置 label.lineBreakMode = UILineBreakModeWordWrap; 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： typedef enum { VerticalAlignmentTop = 0, // default VerticalAlignmentMiddle, VerticalAlignmentBottom, } VerticalAlignment; @interface myUILabel : UILabel { @private VerticalAlignment _verticalAlignment; } @property (nonatomic) VerticalAlignment verticalAlignment; @end @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 { 1. CGRect textRect = [super textRectForBounds:bounds limitedToNumberOfLines:numberOfLines]; 2. 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 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 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 ·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nil label.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17 label.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]; [textLabelStr setAttributes:@{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:bounds limitedToNumberOfLines:20]; //计算20行后的Label的Frame NSLog(@"%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:fonts constrainedToSize:size]; [msgLabel setFrame:CGRectMake(15, 45, 290, msgSie.height)]; 20、渐变字体Label 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]; 21、Label添加边框 titleLabel.layer.borderColor = [[UIColor grayColor] CGColor]; titleLabel.layer.borderWidth = 2; UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];//初始化button，选择button类型 btn.frame = CGRectMake(30, 360, 90, 35);//大小和位置 [btn setTitle:@"ZoomIn" forState:UIControlStateNormal];//正常状况下button显示的标题 [btn setTitle:@"ZoomIn" forState:UIControlStateHighlighted];//高亮显示时button的标题 [btn addTarget:self action:@selector(zoomInAction:) forControlEvents:UIControlEventTouchUpInside];//button被按下又抬起后发生的事件 //@selector可以理解为"选择子"，selector是一个指针变量，类似于sender。这里是将method的方法指定给新建的这个btn。 /*在 method 方法里可以将 sender 看作是 btn 了  比如设置btn的hidden属性等等  btn.hidden = YES;  这样btn被隐藏了 /* // 通过背景图片设置按钮高亮 IImage *normalImage = [UIImage imageNamed:@"NormalBlueButton.png"]; UIImage *highlightedImage = [UIImage imageNamed:@"HighlightedBlueButton"]; self.myButton = [UIButton buttonWithType:UIButtonTypeCustom]; self.myButton.frame = CGRectMake(110.0f,200.0f,100.0f, 37.0f); [self.myButton setBackgroundImage:normalImage forState:UIControlStateNormal]; [self.myButton setBackgroundImage:highlightedImage forState:UIControlStateHighlighted]; [self.myButton setTitle:@"Normal" forState:UIControlStateNormal]; [self.myButton setTitle:@"Pressed" forState:UIControlStateHighlighted]; 1.手写UIButton CGRect btnControlRect=CGRectMake(200, theHeight, 100, 30); UIButton *btnControl=[[UIButton alloc] initWithFrame:btnControlRect]; // 设置按钮的背景图片 [btnControl setBackgroundImage:[UIImage imageNamed:@"desc_nomal.png"] forState:UIControlStateNormal]; [btnControl setBackgroundImage:[UIImage imageNamed:@"desc_nomal.png"] forState:UIControlStateHighlighted]; [btnControl setBackgroundImage:[UIImage imageNamed:@"desc_nomal.png"] forState:UIControlStateSelected]; [btnControl setBackgroundColor:[UIColor clearColor]]; [btnControl addTarget:self action:@selector(ClickControlAction:) forControlEvents:UIControlEventTouchUpInside]; [self.scrollView addSubview:btnControl]; [btnControl release]; // 设置按钮的文本 [_btnOrder setTitle:@"预定" forState:UIControlStateNormal]; [_btnOrder setTitle:@"取消" forState:UIControlStateSelected]; // 设置按钮的文本颜色 [_btnOrder setTitleColor:[UIColor colorWithRed:50/255.0 green:50/255.0 blue:50/255.0alpha:1.0] forState:UIControlStateNormal]; [_btnOrder setTitleColor:[UIColor colorWithRed:255/255.0 green:255/255.0blue:255/255.0 alpha:1.0] forState:UIControlStateSelected]; // 设置按钮的文本大小 [_btnOrder.titleLabel setFont:[UIFont systemFontOfSize:14]]; UITextField的总结 1.UITextField的初始化和设置 textField = [[UITextField alloc] initWithFrame:CGRectMake(120.0f, 80.0f, 150.0f, 30.0f)]; [textField setBorderStyle:UITextBorderStyleRoundedRect]; //外框类型 textField.placeholder = @"password"; //默认显示的字 textField.secureTextEntry = YES; //密码 textField.autocorrectionType = UITextAutocorrectionTypeNo; textField.autocapitalizationType = UITextAutocapitalizationTypeNone; textField.returnKeyType = UIReturnKeyDone; textField.clearButtonMode = UITextFieldViewModeWhileEditing; //编辑时会出现个修改X textField.delegate = self; 2.要实现的Delegate方法,关闭键盘 - (BOOL)textFieldShouldReturn:(UITextField *)textField { [self.textField resignFirstResponder]; return YES; } 3. 可以在UITextField使用下面方法，按return键返回 -(IBAction) textFieldDone:(id) sender { [textFieldName resignFirstResponder]; } 链接TextField控件的"Did end on exit" 最右侧加图片是以下代码, UIImageView *imgv=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"right.png"]]; text.rightView=imgv; text.rightViewMode = UITextFieldViewModeAlways; 如果是在最左侧加图片就换成: text.leftView=imgv; text.leftViewMode = UITextFieldViewModeAlways; UITextField 继承自 UIControl,此类中有一个属性contentVerticalAlignment 所以想让UITextField里面的text垂直居中可以这样写: text.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter; 查看函数的方法：按住command键双击进入函数声明按住alt键双击进入doc文档 /////////////////////////////////////////////////////////////// 文本框常用方法: 如何用程序删除文本框中选中的文本 [textView delete: nil]; /////////////////////////////////////////////////////////////// 如何限制文本框只能输入数字: 建立NSNumberFormatter的子类，增加这个方法，将formatter链接至文本框。 - (BOOL) isPartialStringValid: (NSString **) partialStringPtr proposedSelectedRange: (NSRangePointer) proposedSelRangePtr originalString: (NSString *) origString originalSelectedRange: (NSRange) origSelRange errorDescription: (NSString **) error { NSCharacterSet *nonDigits; NSRange newStuff; NSString *newStuffString; nonDigits = [[NSCharacterSet decimalDigitCharacterSet] invertedSet]; newStuff = NSMakeRange(origSelRange.location, proposedSelRangePtr->location - origSelRange.location); newStuffString = [*partialStringPtr substringWithRange: newStuff]; if ([newStuffString rangeOfCharacterFromSet: nonDigits options: NSLiteralSearch].location != NSNotFound) { *error = @"不是数字"; return (NO); } else { *error = nil; return (YES); } } /////////////////////////////////////////////////////////////// 从文本框获取十六进制数据的代码 char singleNumberString[3] = {'\0','\0','\0'}; uint32_t singleNumber = 0; uint32_t i = 0; NSMutableData *data = [NSMutableData data]; //从文本框获取到得数据 const char *buf = [[_hexToSendTextField text] UTF8String]; //转换为十六进制 for(i = 0; i < strlen(buf); i+=2) { if(((i+1) < len && isxdigit(buf) && (isxdigit(buf[i+1]))) { singleNumberString[0] = buf; singleNumberString[1] = buf[i+1]; sscanf(singleNumberString, "%x", &singleNumber); [data appendBytes:(void*)(&tmp) length:1]; } else { break; } } //输出 NSLog(@"%@", data); ///////////////////////////////////////////////////////////// 点击 UITextView 输入文字，光标都从最初点开始 - (void)textViewDidChangeSelection:(UITextView *)textView { NSRange range; range.location = 0; range.length = 0; textView.selectedRange = range; } /////////////////////////////////////////////////////////// 软键盘在登录页面要实现用户名和密码，密码要是点点格式，引入当前页面光标要停留在用户名选项，软键盘要弹出界面。如下图：弹出键盘： [username becomeFirstResponder]; 取消键盘： [username resignFirstResponder]; 密码保护： password.secureTextEntry=YES; ////////////////////////////////////////////////////////////////// 1.UITextField的初始化和设置 textField = [[UITextField alloc] initWithFrame:CGRectMake(120.0f, 80.0f, 150.0f, 30.0f)]; [textField setBorderStyle:UITextBorderStyleRoundedRect]; //外框类型 textField.placeholder = @"password"; //默认显示的字 textField.secureTextEntry = YES; //密码 textField.autocorrectionType = UITextAutocorrectionTypeNo; textField.autocapitalizationType = UITextAutocapitalizationTypeNone; textField.returnKeyTyp

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