通过继承制作简单的控件类

      苹果给开发者提供了UITextField,UILabel,UIButton等简单的控件。但是仅仅这些控件远远不能满足我们成员的需求，所以需要我们自己制作控件，来实现我们的需求。曾经有人这么说过，在iphone里你看到的，摸到的，都是UIView，所以UIView在iphone开发里具有非常重要的作用。我们通过继承UIView来实现我们自己的控件（代码如下.h文件）：

@interface MyCombinationControl : UIView  <UITextFieldDelegate>{    @private    UITextField* _textFeild; //定义一个编辑框    UILabel* _label;//定义一个}@property(nonatomic,retain)NSString* title; //设置标题@property(nonatomic,retain)NSString* placeHolderStr;//设置占位符@property(nonatomic,retain)NSString* text;//文本内容@property(nonatomic,assign)BOOL secureTextEntry;//是否是密码框-(id)initWithFrame:(CGRect)frame title:(NSString*)title placeHolderStr:(NSString*)placeHolderStr secureTextEntry:(BOOL)secureTextEntry;//初始化方法@end

以下是实现：

@implementation MyCombinationControl- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code            }    return self;}-(id)initWithFrame:(CGRect)frame title:(NSString *)title placeHolderStr:(NSString *)placeHolderStr secureTextEntry:(BOOL)secureTextEntry{    self  = [self initWithFrame:frame];    if (self) {        //定义基本的label控件        _label= [[UILabel alloc]initWithFrame:CGRectMake(0, 0, frame.size.width/3, frame.size.height)];//通过比例分配控件大小及其位置        _label.backgroundColor=[UIColor redColor];//设置label的背景颜色        _label.text = title;//设置label标题        _label.font = [UIFont boldSystemFontOfSize:20];//设置label字体        _label.textColor=[UIColor blueColor];//设置label的文本的字体颜色        _label.baselineAdjustment=UIBaselineAdjustmentAlignCenters;//控制文本基线时调整文本需要收缩标签        _label.textAlignment = NSTextAlignmentCenter;//排列方式        //定义基本的textfield控件        _textFeild = [[UITextField alloc]initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];//        _textFeild.layer.cornerRadius =15;//圆角半径        _textFeild.delegate=self;//设置代理        _textFeild.placeholder=placeHolderStr;//占位符        _textFeild.textColor = [UIColor  redColor];//设置文本颜色        _textFeild.clearsOnInsertion = YES;//插入光标删除        _textFeild.clearButtonMode = YES;//是否显示清除按钮        _textFeild.borderStyle = UITextBorderStyleRoundedRect;//边框样式        _textFeild.autocorrectionType = UITextAutocorrectionTypeNo;//取消自动提示        _textFeild.autocapitalizationType=UITextAutocapitalizationTypeNone;//首字母大小写        _textFeild.spellCheckingType=UITextSpellCheckingTypeNo;//拼写检查        _textFeild.keyboardAppearance=UIKeyboardAppearanceAlert;//键盘样式        _textFeild.returnKeyType=UIReturnKeyGo;//return样式        _textFeild.enablesReturnKeyAutomatically =YES;//该输入框的内容是否必须        _textFeild.secureTextEntry = secureTextEntry;//文本内容是否是密码        _textFeild.layer.borderColor = [[UIColor redColor]CGColor];//边框颜色        _textFeild.layer.borderWidth=3.0f;//边框大小        _textFeild.leftView = _label;        _textFeild.leftViewMode=UITextFieldViewModeAlways;        _textFeild.layer.opacity=0.5;        [self addSubview:_textFeild];    }    return self;}-(NSString*)text{    return  _textFeild.text;}-(void)setText:(NSString *)text{    _textFeild.text  = text;}-(BOOL)secureTextEntry{    return _textFeild.secureTextEntry;}-(void)setSecureTextEntry:(BOOL)secureTextEntry{    _textFeild.secureTextEntry = secureTextEntry;}@end

以上实现一个基本的控件效果图如下：

今天我们先讲通过继承实现简单控件封装，下次实现通过类目，延展。以及他们的组合体实现稍微复杂的封装方式