IOS之KVC和KVO(未完待续)

2022-03-26 16:21:42

*:first-child {
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body > *:last-child {
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a {
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a.absent {
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a.anchor {
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h1, h2, h3, h4, h5, h6 {
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h1:hover a.anchor, h2:hover a.anchor, h3:hover a.anchor, h4:hover a.anchor, h5:hover a.anchor, h6:hover a.anchor {
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h6 tt, h6 code {
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h1 {
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color: black; }

h2 {
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color: black; }

h3 {
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h4 {
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h5 {
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h6 {
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body > h2:first-child {
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body > h1:first-child {
margin-top: 0;
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body > h1:first-child + h2 {
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body > h3:first-child, body > h4:first-child, body > h5:first-child, body > h6:first-child {
margin-top: 0;
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a:first-child h1, a:first-child h2, a:first-child h3, a:first-child h4, a:first-child h5, a:first-child h6 {
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h1 p, h2 p, h3 p, h4 p, h5 p, h6 p {
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li p.first {
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li {
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ul, ol {
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ul :first-child, ol :first-child {
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dl {
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dl dt {
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font-weight: bold;
font-style: italic;
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dl dt:first-child {
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dl dt > :first-child {
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dl dt > :last-child {
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dl dd {
margin: 0 0 15px;
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dl dd > :first-child {
margin-top: 0; }
dl dd > :last-child {
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blockquote {
border-left: 4px solid #dddddd;
padding: 0 15px;
color: #777777; }
blockquote > :first-child {
margin-top: 0; }
blockquote > :last-child {
margin-bottom: 0; }

table {
padding: 0;border-collapse: collapse; }
table tr {
border-top: 1px solid #cccccc;
background-color: white;
margin: 0;
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table tr:nth-child(2n) {
background-color: #f8f8f8; }
table tr th {
font-weight: bold;
border: 1px solid #cccccc;
margin: 0;
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table tr td {
border: 1px solid #cccccc;
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table tr th :first-child, table tr td :first-child {
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table tr th :last-child, table tr td :last-child {
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img {
max-width: 100%; }

span.frame {
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overflow: hidden; }
span.frame > span {
border: 1px solid #dddddd;
display: block;
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span.frame span span {
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span.align-center {
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span.align-center > span {
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span.align-center span img {
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span.align-right {
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span.align-right > span {
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span.float-left {
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float: left; }
span.float-left span {
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span.float-right {
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span.float-right > span {
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code, tt {
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KVC和KVO

KVC : Key value Coding

作用：

1、kVC可以给对象的私有变量赋值

2、用于字典转模型(到后面用MJExtension)

3、通过KVC取出私有变量值

4、模型对象转字典(了解)

利用KVC赋值：

IOS之KVC和KVO(未完待续)

IOS之KVC和KVO(未完待续)

利用KVC取值

IOS之KVC和KVO(未完待续)

使用注意：

1、设置key/keyPath位置的字符串必须保证有对应的属性(或者_属性)

    否则会报错

2、字典转模型的使用注意：

    2-1、必须保证字典中对应key在模型中能找到对应的属性

    2-2、模型中的属性可以在字典中没有对应的Key

setValue:forKey:和setValue:forKeyPath区别

    keyPath可以根据内部点语法,进一步查找对应的key

IOS之KVC和KVO(未完待续)

KVO : Key value Observer

作用：监听 对象的属性 发生改变

Observer : 观察者,谁要做事情谁就成为观察者

KeyPath : 观察的属性

options : 传入新值还是旧值

KVO未完待续。

 
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