自定义视图.

自定义视图:

    自定义视图:除了系统UI提供的各种视图外,自己可以利用各种控件组合成各种的新的视图,积累自己的代码库,方便自己开发.

    自定义视图的步骤(再次以Label和TextField为例):

       1.创建一个UIView的子类

    2.在类的初始化方法中添加视图

//初始化方法-(instancetype)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        [self addAllSubviews];//在初始方法中添加视图    }    return self;}//添加视图-(void)addAllSubviews{        //UILabel    _label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0,self.frame.size.width /3, self.frame.size.height)];    [self addSubview:_label];    //UITextField    _textField = [[UITextField alloc]initWithFrame:CGRectMake(self.frame.size.width / 3 ,0,self.frame.size.width / 3 * 2,self.frame.size.height)];        [self addSubview:_textField];    //UIButton    _button = [UIButton buttonWithType:UIButtonTypeRoundedRect];    _button.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y + 10, self.frame.size.width, self.frame.size.height);    [self addSubview:_button];}

     3.在.h的文件中提供一些接口(方法),便于外界操作

////  Login.h//  UIlession3_review////  Created by lanou3g on 15/8/26.//  Copyright (c) 2015年 lanou3g. All rights reserved.////自定义登陆界面视图#import <UIKit/UIKit.h>@interface Login : UIView <UITextFieldDelegate>@property(nonatomic,readonly,retain)UILabel *label;@property(nonatomic,readonly,retain)UITextField *textField;@property(nonatomic,retain)UIButton *button;//设置TextField的样式-(void)setTextFieldStyle:(UITextBorderStyle)style;//设置Label和TextField的字体-(void)setLabelText:(NSString *)str;-(void)setTextFieldPlaceholder:(NSString *)str;//字体的对齐方式-(void)setLabelTextAlignment:(NSTextAlignment)alignment;-(void)settextFieldAlignment:(NSTextAlignment)alignment;//清除模式-(void)setTextfieldClearMode:(UITextFieldViewMode)clearMode;//密文模式-(void)setTextSecurity:(BOOL)security;//代理模式-(void)setDelegate;@end

在.m中实现上述方法:

<span style="font-size:18px;">//设置边框样式-(void)setTextFieldStyle:(UITextBorderStyle)style{    self.textField.borderStyle = style;}//设置Label和TextField的字体-(void)setLabelText:(NSString *)str{    self.label.text = str;}-(void)setTextFieldPlaceholder:(NSString *)str{    self.textField.placeholder = str;}//设置对齐方式-(void)setLabelTextAlignment:(NSTextAlignment)alignment{    self.label.textAlignment = alignment;}-(void)settextFieldAlignment:(NSTextAlignment)alignment{    self.textField.textAlignment = alignment;}//清除模式-(void)setTextfieldClearMode:(UITextFieldViewMode)clearMode{    _textField.clearButtonMode = clearMode;}//密文模式-(void)setTextSecurity:(BOOL)security{    _textField.secureTextEntry = security;}//代理模式-(void)setDelegate{    self.textField.delegate = self;}//实现代理-(BOOL)textFieldShouldReturn:(UITextField *)textField{    [textField resignFirstResponder];    return YES;}</span><span style="font-size:18px;">测试文件:</span><pre name="code" class="objc">    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];    [self.window makeKeyAndVisible];        UIView *backgroundView = [[UIView alloc]initWithFrame:[UIScreen mainScreen].bounds];    backgroundView.backgroundColor = [UIColor whiteColor];    [self.window addSubview:backgroundView];        Login *login = [[Login alloc]initWithFrame:CGRectMake(40, 40, 300, 40)];    [backgroundView addSubview:login];        //设置边框的样式    [login setTextFieldStyle:UITextBorderStyleRoundedRect];        //设置字体    [login setLabelText:@"登陆:"];    [login setTextFieldPlaceholder:@"用户名/手机号/邮箱"];        //字体对齐方式    [login setLabelTextAlignment:NSTextAlignmentCenter];    [login settextFieldAlignment:NSTextAlignmentLeft];    //清除模式    [login setTextfieldClearMode:UITextFieldViewModeAlways];        //密文模式    [login setTextSecurity:YES];        //代理    [login setDelegate];