JFTabView 标签滑动视图封装
Posted JeffreyW
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JFTabView 标签滑动视图封装
项目中好多个地方需要上面标签，下面滑动视图的界面，有时候个数还不同，于是写了个封装。封装的JFtabView内部的包括点击滑动，布局等都自动完成，只需要直接传入需要的子视图和按钮即可显示界面，当然，下面滑动控件具体每个视图，还是需要自己去根据需求来做。外部的按钮点击方法也需要自己去做（点击的各种切换已经实现，不需要额外去写）
一.h文件
//
// JFTabView.h
// JFTabViewMaster
//
// Created by Jeffrey on 2017/5/16.
// Copyright © 2017年 Jeffrey. All rights reserved.
//
#import <UIKit/UIKit.h>
typedef void(^JFLayoutCallBack)(UIView *topView,NSArray *buttons);
@class JFTabObject;
@interface JFTabView : UIView
/**内部包含的关联控件类数组，每个包含一个scrollView里面的subview和上面的一个按钮*/
@property(nonatomic, strong, readonly) NSArray<JFTabObject*>*subTabObjects;
#pragma mark --- 头部topView相关属性
/**头部的topView，可用改变其属性，但是无法直接重新赋值，需要改变内部约束请使用layoutTopViewCustomCallback回调属性*/
@property(nonatomic, strong, readonly) UIView *topView;
/**一般下面的scrollView只会传视图即可，上方的topView肯能需要自定义布局，如果需要，
* 拿这个回调布局即可(讨厌协议写法，来回倒腾遵守协议啥还不如block直观）*/
@property(nonatomic, copy) JFLayoutCallBack layoutTopViewCustomCallback;
/**上面topView高度，只读，展现的时候需要赋值*/
@property(nonatomic, assign,readonly) CGFloat topViewHeight;
/**每个bt的大小，内部是约束布局，大小只能通过它来设置*/
@property(nonatomic, assign) CGSize btSize;
#pragma mark --- 滑块相关属性
/**上面滑块高度，默认为5*/
@property(nonatomic, assign) CGFloat topViewLineHeight;
/**上面滑块高度，默认为和按钮等宽*/
@property(nonatomic, assign) CGFloat topViewLineWidth;
/**上面滑块高度对应按钮倍数，该参数生效优先级比上面topViewLineWidth高*/
@property(nonatomic, assign) CGFloat topViewLineWidthMultiplier;
/**滑块颜色，默认为红色*/
@property(nonatomic, strong) UIColor *topViewLineColor;
#pragma mark --- 主要显示方法
/**
* 主要方法，传入subTabObjects数组，根据内部定义的按钮和子视图以及上方的高度来显示视图
* @param subTabObjects 内部关联控件，每个包含一个scrollView的子视图和上方的按钮
* @param topViewHeight 上方topView的高度
*/
- (void)showWithSubTabObjects:(NSArray <JFTabObject *> *)subTabObjects topViewHeight:(CGFloat)topViewHeight;
@end
@interface JFTabObject : NSObject
/**单个子视图，在scrollView内部每个块需要含一个*/
@property(nonatomic, strong) UIView *scrollSubView;
/**topView上方按钮，和下面scrollView一一对应*/
@property(nonatomic, strong) UIButton *btSubView;
#pragma mark --- 初始化方法
- (instancetype)initWithScrollSubView:(UIView *)scrollSubView btSubView:(UIButton *)btSubView;
+ (instancetype)objectWithScrollSubView:(UIView *)scrollSubView btSubView:(UIButton *)btSubView;
@end
二.m文件
//
// JFTabView.m
// JFTabViewMaster
//
// Created by Jeffrey on 2017/5/16.
// Copyright © 2017年 Jeffrey. All rights reserved.
//
#import "JFTabView.h"
@interface JFTabView () <UIScrollViewDelegate>
@property(nonatomic, strong) UIScrollView *scrollView;
@property(nonatomic, strong) UIView *topViewLine;
@property(nonatomic, strong) NSLayoutConstraint *layoutConstraintX;
@end
@implementation JFTabView
/**如果xib读取，则会按照这个方法来初始化*/
- (instancetype)initWithCoder:(NSCoder *)aDecoder
self = [super initWithCoder:aDecoder];
if (self)
[self initializeFirst];
return self;
/**常规手写代码初始化*/
- (instancetype)initWithFrame:(CGRect)frame
self = [super initWithFrame:frame];
if (self)
[self initializeFirst];
return self;
/**初始化都调用它，让子控件也正确初始化出来*/
- (void)initializeFirst
[self setValue:[[UIView alloc] init] forKey:@"topView"];
self.topView.translatesAutoresizingMaskIntoConstraints = NO;
[self addSubview:self.topView];
self.scrollView = [[UIScrollView alloc] init];
self.scrollView.bounces = NO;
self.scrollView.pagingEnabled = YES;
self.scrollView.translatesAutoresizingMaskIntoConstraints = NO;
self.scrollView.delegate = self;
[self addSubview:self.scrollView];
self.topViewLine = [[UIView alloc] init];
[self.topView addSubview:self.topViewLine];
- (void)showWithSubTabObjects:(NSArray <JFTabObject *> *)subTabObjects topViewHeight:(CGFloat)topViewHeight
[self setValue:@(topViewHeight) forKey:@"topViewHeight"];
[self setValue:subTabObjects forKey:@"subTabObjects"];
/**设置第一个按钮未选中且不可用*/
UIButton *btFirst = self.subTabObjects.firstObject.btSubView;
btFirst.selected = YES;
btFirst.userInteractionEnabled = NO;
[self layoutTopView];
[self layoutScrollView];
[self layoutSubButtons];
[self layoutTopViewLine];
[self layoutTopViewCustom];
[self layoutScrollViewSubViews];
/**头部topView布局，只会根据之前设置的topViewHeight属性在整个控件中布局高度，宽度和整个控件等宽*/
- (void)layoutTopView
NSDictionary *metricsTopView = @
@"topViewHeight": @(self.topViewHeight)
;
UIView *topView = self.topView;
NSString *ltFtTopViewV = @"V:|-0-[topView(==topViewHeight)]";
NSString *ltFtTopViewH = @"H:|-0-[topView]-0-|";
NSArray *ltTopViewV = [NSLayoutConstraint constraintsWithVisualFormat:ltFtTopViewV options:(NSLayoutFormatOptions) 0 metrics:metricsTopView views:NSDictionaryOfVariableBindings(topView)];
NSArray *ltTopViewH = [NSLayoutConstraint constraintsWithVisualFormat:ltFtTopViewH options:(NSLayoutFormatOptions) 0 metrics:metricsTopView views:NSDictionaryOfVariableBindings(topView)];
NSMutableArray *ltConstraints = [[NSMutableArray alloc] init];
[ltConstraints addObjectsFromArray:ltTopViewV];
[ltConstraints addObjectsFromArray:ltTopViewH];
[self addConstraints:ltConstraints];
/**scrollView布局，上方和topView对齐，下方和整个控件底部对齐*/
- (void)layoutScrollView
UIScrollView *scrollView = self.scrollView;
UIView *topView = self.topView;
NSString *ltFtScrollViewV = @"V:[topView]-0-[scrollView]-0-|";
NSString *ltFtScrollViewH = @"H:|-0-[scrollView]-0-|";
NSArray *ltScrollViewV = [NSLayoutConstraint constraintsWithVisualFormat:ltFtScrollViewV options:(NSLayoutFormatOptions) 0 metrics:nil views:NSDictionaryOfVariableBindings(scrollView, topView)];
NSArray *ltScrollViewH = [NSLayoutConstraint constraintsWithVisualFormat:ltFtScrollViewH options:(NSLayoutFormatOptions) 0 metrics:nil views:NSDictionaryOfVariableBindings(scrollView, topView)];
NSMutableArray *ltConstraints = [[NSMutableArray alloc] init];
[ltConstraints addObjectsFromArray:ltScrollViewV];
[ltConstraints addObjectsFromArray:ltScrollViewH];
[self addConstraints:ltConstraints];
/**按钮布局，传入关联控件数组有n个，那么中心线就按照n+1分之一。高宽则根据属性btSize来确定*/
- (void)layoutSubButtons
for (int i = 0; i < self.subTabObjects.count; i++)
JFTabObject *tabObject = self.subTabObjects[(NSUInteger) i];
UIButton *button = tabObject.btSubView;
button.tag = i;
[self.topView addSubview:button];
button.translatesAutoresizingMaskIntoConstraints = NO;
if (!CGSizeEqualToSize(self.btSize, CGSizeZero))
[self setLayoutWidth:self.btSize.width view:button];
[self setLayoutHeight:self.btSize.height view:button];
[button addTarget:self action:@selector(clickButton:) forControlEvents:UIControlEventTouchUpInside];
CGFloat multiplierH = (CGFloat) (1 / ((CGFloat) self.subTabObjects.count + 1) * (i + 1));
/**竖直约束*/
NSLayoutConstraint *layoutConstraintY = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.topView attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
[self.topView addConstraint:layoutConstraintY];
/**横向约束*/
NSLayoutConstraint *layoutConstraintX = [NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.topView attribute:NSLayoutAttributeTrailing multiplier:multiplierH constant:0];
[self.topView addConstraint:layoutConstraintX];
/**滑块布局，和第一个按钮的布局一样，只是高宽分别有属性topViewLineHeight和
* topViewLineWidth(topViewLineWidthMultiplier也可以)来控制*/
- (void)layoutTopViewLine
CGFloat multiplierH = (CGFloat) (1 / ((CGFloat) self.subTabObjects.count + 1));
self.topViewLine.translatesAutoresizingMaskIntoConstraints = NO;
self.topViewLine.backgroundColor = self.topViewLineColor ? self.topViewLineColor : [UIColor redColor];
UIButton *btFirst = self.subTabObjects.firstObject.btSubView;
/**滑块宽度,如果有精确宽度且没指定按钮宽度倍数，那么按照精确的宽度。否则按照指定倍数（没指定则按1倍默认走)*/
BOOL hasExactWidth = self.topViewLineWidth > 0 && self.topViewLineWidthMultiplier == 0;
if (hasExactWidth)
[self setLayoutWidth:self.topViewLineWidth view:self.topViewLine];
else
/**要么精确高度没有指定，倍数也没指定，要么精确高度指定且倍数也指定*/
CGFloat multiplier = self.topViewLineWidthMultiplier > 0 ? self.topViewLineWidthMultiplier : 1;
NSLayoutConstraint *layoutConstraintWidth = [NSLayoutConstraint constraintWithItem:self.topViewLine attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:btFirst attribute:NSLayoutAttributeWidth multiplier:multiplier constant:0];
[self.topView addConstraint:layoutConstraintWidth];
self.topViewLineHeight = self.topViewLineHeight > 0 ? self.topViewLineHeight : 5.0f;
[self setLayoutHeight:self.topViewLineHeight view:self.topViewLine];
/**竖直约束*/
NSLayoutConstraint *layoutConstraintY = [NSLayoutConstraint constraintWithItem:self.topViewLine attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.topView attribute:NSLayoutAttributeBottom multiplier:1 constant:0];
[self.topView addConstraint:layoutConstraintY];
/**横向约束,这里会滑动，所以设置为属性*/
self.layoutConstraintX = [NSLayoutConstraint constraintWithItem:self.topViewLine attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.topView attribute:NSLayoutAttributeTrailing multiplier:multiplierH constant:0];
[self.topView addConstraint:self.layoutConstraintX];
/**自定义布局，回传所有buttons和topiew*/
- (void)layoutTopViewCustom
if (self.layoutTopViewCustomCallback)
NSMutableArray *buttons = [NSMutableArray array];
for (JFTabObject *tabObject in self.subTabObjects)
[buttons addObject:tabObject.btSubView];
self.layoutTopViewCustomCallback(self.topView, buttons);
/**scrollView内部布局，根据给的数组属性subTabObjects以及其内部的scrollSubView确定子视图的布局*/
- (void)layoutScrollViewSubViews
UIView *lastView = nil;
UIScrollView *scrollView = self.scrollView;
UIView *topView = self.topView;
for (JFTabObject *tabObject in self.subTabObjects)
UIView *scrollSubView = tabObject.scrollSubView;
[self.scrollView addSubview:scrollSubView];
scrollSubView.translatesAutoresizingMaskIntoConstraints = NO;
for (int i = 0; i < self.subTabObjects.count; i++)
JFTabObject *tabObject = self.subTabObjects[(NSUInteger) i];
UIView *subView = tabObject.scrollSubView;
NSMutableArray *ltConstraints = [[NSMutableArray alloc] init];
/**垂直方向参照为superView，即scrollView，高度也为scrollView的高度*/
NSString *ltFtSubViewV = @"V:|-0-[subView(scrollView)]-0-|";
NSArray *ltSubViewV = [NSLayoutConstraint constraintsWithVisualFormat:ltFtSubViewV options:(NSLayoutFormatOptions) 0 metrics:nil views:NSDictionaryOfVariableBindings(subView, topView, scrollView, self)];
[ltConstraints addObjectsFromArray:ltSubViewV];
/**subview左边约束均为0,如果是第一个视图，那么左边为superview，否则为lastView*/
NSString *ltFtSubViewHLeft = i == 0 ? @"H:|-0-[subView(topView)]" : @"H:[lastView]-0-[subView(topView)]";
/**如果是第一个视图，添加约束的时候不用添加lastView，因为还没生成*/
NSDictionary *views = i == 0 ? NSDictionaryOfVariableBindings(subView, topView, scrollView, self) : NSDictionaryOfVariableBindings(subView, lastView, topView, scrollView, self);
NSArray *ltSubViewHLeft = [NSLayoutConstraint constraintsWithVisualFormat:ltFtSubViewHLeft options:(NSLayoutFormatOptions) 0 metrics:nil views:views];
[ltConstraints addObjectsFromArray:ltSubViewHLeft];
/**到最后右边约束和scrollView为0即可*/
if (i == (self.subTabObjects.count - 1))
NSString *ltFtSubViewHRight = @"H:[subView(topView)]-0-|";
NSArray *ltSubViewHRight = [NSLayoutConstraint constraintsWithVisualFormat:ltFtSubViewHRight options:(NSLayoutFormatOptions) 0 metrics:nil views:NSDictionaryOfVariableBindings(subView, topView, scrollView, self)];
[ltConstraints addObjectsFromArray:ltSubViewHRight];
[self addConstraints:ltConstraints];
lastView = subView;
/**高度约束简写*/
- (void)setLayoutHeight:(CGFloat)height view:(UIView *)view
NSDictionary *views = NSDictionaryOfVariableBindings(view);
NSString *format = @"V:[view(height)]";
NSDictionary *metrics = @
@"height": @(height)
;
NSArray *array = [NSLayoutConstraint constraintsWithVisualFormat:format options:(NSLayoutFormatOptions) 0 metrics:metrics views:views];
[view.superview addConstraints:array];
/**宽度约束简写*/
- (void)setLayoutWidth:(CGFloat)width view:(UIView *)view
NSDictionary *views = NSDictionaryOfVariableBindings(view);
NSString *format = @"H:[view(width)]";
NSDictionary *metrics = @
@"width": @(width)
;
NSArray *array = [NSLayoutConstraint constraintsWithVisualFormat:format options:(NSLayoutFormatOptions) 0 metrics:metrics views:views];
[view.superview addConstraints:array];
/**点击事件，选中单个按钮，其他按钮都变为未选中，如果点击已选中的按钮，其不可用，外部代码也不可点击*/
- (void)clickButton:(UIButton *)clickButton
NSLog(@"点击了%d", clickButton.tag);
for (JFTabObject *tabObject in self.subTabObjects)
UIButton *currentBt = tabObject.btSubView;
/**当前点击的如果被选中，设置不可选中，如果没被选中，改为选中，其它按钮变为未选中*/
if (currentBt == clickButton)
clickButton.selected = !clickButton.selected;
clickButton.userInteractionEnabled = !clickButton.selected;
else
currentBt.selected = NO;
currentBt.userInteractionEnabled = YES;
CGFloat width = CGRectGetWidth(self.bounds);
[UIView animateWithDuration:0.3 animations:^
self.scrollView.contentOffset = CGPointMake(width * (clickButton.tag), 0);
self.layoutConstraintX.constant = (CGFloat) ((1.0 / (self.subTabObjects.count + 1)) * width * clickButton.tag);
completion:^(BOOL finished)
];
#pragma mark --- scrollView代理
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
CGFloat width = CGRectGetWidth(self.bounds);
CGFloat index = scrollView.contentOffset.x / width;
self.scrollView.contentOffset = CGPointMake((width * (index)), 0);
self.layoutConstraintX.constant = (CGFloat) ((1.0 / (self.subTabObjects.count + 1)) * width * index);
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
CGFloat width = CGRectGetWidth(self.bounds);
CGFloat index = scrollView.contentOffset.x / width;
NSNumber *indexNumber = [[NSNumber alloc] initWithFloat:index];
/**整数和小数相等则表示滑动到了按钮位置*/
if (indexNumber.intValue == indexNumber.floatValue)
UIButton *clickBtAuto = self.subTabObjects[(NSUInteger) indexNumber.integerValue].btSubView;
if (clickBtAuto.userInteractionEnabled)
[self clickButton:clickBtAuto];
@end
@implementation JFTabObject
- (instancetype)initWithScrollSubView:(UIView *)scrollSubView btSubView:(UIButton *)btSubView
self = [super init];
if (self)
self.scrollSubView = scrollSubView;
self.btSubView = btSubView;
return self;
+ (instancetype)objectWithScrollSubView:(UIView *)scrollSubView btSubView:(UIButton *)btSubView
return [[self alloc] initWithScrollSubView:scrollSubView btSubView:btSubView];
@end
三.使用
主要使用- (void)showWithSubTabObjects:(NSArray <JFTabObject *> *)subTabObjects topViewHeight:(CGFloat)topViewHeight
这里JFTabObject为关联对象，每个对象包含一个子视图和一个按钮，这样上面的按钮和下面的每个视图一一对应。设置好后直接调用上面方法即可显示。
四.其它设置
常规来说，只需要调用showWith方法，传入对应的参数即可显示，你还可以根据h文件里的一些可选参数来设置如何显示，例如可以设置滑块的高宽，按钮的高宽等，具体可以在h文件中查看
五.原理
其实只是简单的一个UIView，里面包含了上部的topView，下面为UIScrollView，内部会根据showWith方法传入的参数来进行视图和按钮的初始化，可选参数则可以进行定制显示，另外可选参数中的layoutTopViewCustomCallback属性是个block，可以利用它和内部的按钮和topView配合在topView中进行添加额外视图的操作。scrollView里则没有配置相关方法，因为本身就需要传入各个视图，每个视图都是你已经需要的了。
五.例子
代码请点:这里
使用的代码如下
//
// ViewController.m
// JFTabViewMaster
//
// Created by Jeffrey on 2017/5/16.
// Copyright (c) 2017 Jeffrey. All rights reserved.
//
#import "ViewController.h"
#import "JFTabView.h"
@interface ViewController () <UITableViewDelegate, UITableViewDataSource>
@property(nonatomic, weak) IBOutlet JFTabView *tabView;
@property(nonatomic, strong) UITableView *tableViewNone;
@property(nonatomic, strong) NSArray *dataSourceOne;
@end
@implementation ViewController
- (void)viewDidLoad
[super viewDidLoad];
/**第一页tableview以及其数据源设置*/
self.tableViewNone = [[UITableView alloc] init];
self.tableViewNone.delegate = self;
self.tableViewNone.dataSource = self;
NSMutableArray *dataSourceOne = [NSMutableArray array];
for (int i = 0; i < 100; i++)
[dataSourceOne addObject:@(i)];
self.dataSourceOne = dataSourceOne;
self.tableViewNone.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
/**第一页的buuton和关联对象初始化*/
UIButton *button1 = [[UIButton alloc] init];
[button1 setTitle:@"第一页" forState:UIControlStateNormal];
[button1 setTitle:@"第一页" forState:UIControlStateSelected];
[button1 setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
[button1 setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
JFTabObject *object1 = [JFTabObject objectWithScrollSubView:self.tableViewNone btSubView:button1];
/**第二页常规View，加载了一个xib里的View*/
UIView *ViewTwo = [[NSBundle mainBundle] loadNibNamed:@"CustomView" owner:nil options:nil].firstObject;
/**第二页的buuton和关联对象初始化*/
UIButton *button2 = [[UIButton alloc] init];
[button2 setTitle:@"第二页" forState:UIControlStateNormal];
[button2 setTitle:@"第二页" forState:UIControlStateSelected];
[button2 setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
[button2 setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
JFTabObject *object2 = [JFTabObject objectWithScrollSubView:ViewTwo btSubView:button2];
UIView *viewThree = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 300)];
viewThree.backgroundColor = [UIColor redColor];
UIButton *button3 = [[UIButton alloc] init];
[button3 setTitle:@"第三页" forState:UIControlStateNormal];
[button3 setTitle:@"第三页" forState:UIControlStateSelected];
[button3 setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
[button3 setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
JFTabObject *object3 = [JFTabObject objectWithScrollSubView:viewThree btSubView:button3];
/**传入指定对象数组*/
NSArray *subTabObjects = @[object1, object2, object3];
/**设置按钮高宽*/
// self.tabView.btSize = CGSizeMake(20, 30);
/**滑块高度，默认就是5*/
self.tabView.topViewLineHeight = 5;
/**滑块宽度倍数默认，具体看注释*/
self.tabView.topViewLineWidthMultiplier = 2;
/**手动添加布局到topView*/
UILabel *label = [[UILabel alloc] init];
label.text = @"外部添加在topView上的测试";
self.tabView.layoutTopViewCustomCallback = ^(UIView *topView, NSArray *buttons)
label.translatesAutoresizingMaskIntoConstraints = NO;
[topView addSubview:label];
label.font = [UIFont systemFontOfSize:10];
NSLayoutConstraint *layoutConstraintTop = [NSLayoutConstraint constraintWithItem:label attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:topView attribute:NSLayoutAttributeTop multiplier:1 constant:0];
[topView addConstraint:layoutConstraintTop];
NSLayoutConstraint *layoutConstraintV = [NSLayoutConstraint constraintWithItem:label attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:topView attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
[topView addConstraint:layoutConstraintV];
;
/**开始展现*/
[self.tabView showWithSubTabObjects:subTabObjects topViewHeight:60];
// Do any additional setup after loading the view, typically from a nib.
- (void)didReceiveMemoryWarning
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
return 1;
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
return self.dataSourceOne.count;
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
static NSString *ID = @"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
if (!cell)
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
NSNumber *number = self.dataSourceOne[(NSUInteger) indexPath.row];
cell.textLabel.text = number.stringValue;
return cell;
@end
效果如下图：
第一页是加载的UITableview，第二页加载是xib的常规UIView，第三页直接手写初始化的UIView。注意，如果手动添加view，最好是用代码布局，不要仅仅是使用fram。因为内部都是用布局写的，不是用frame写的。
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