The difference between declaring a variable in a "go" ios,objective_c with a @interface and @property way
Last Update:2015-08-07
Source: Internet
Author: User
<span id="Label3"></p><p><p><span style="word-wrap: break-word; color: #333333;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;">Original: http://blog.csdn.net/ganlijianstyle/article/details/7924446</span></span></span></p></p><p><p><span style="word-wrap: break-word; color: #333333;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;">1. In the parentheses of @interface: nsobject{}, of course nsobject refers to a parent class, which can be other.</span></span></span></p></p><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;">The form is as Follows:</span></span></p></p><p><span style="word-wrap: break-word; color: #333333;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #0000ff;">@interface<span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;">Gcturnbasedmatchhelper:nsobject {<br style="word-wrap: break-word; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap:break-word; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;">& nbsp BOOL GAMECENTERAVAILABLE;<br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "><span style="word-wrap:break-word; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;"> BOOL USERAUTHENTICATED;<br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "><span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;"> }<br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "><br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "></span></span></span></span></span></span></span></span></span></p><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><p style="word-wrap:break-word; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:25px; text-align:left; "><span style="word-wrap:break-word; color: #333333;"><span style="font-family:verdana,arial,helvetica, sans-serif; word-wrap:break-word; ">2. the other is to use @property to define a variable directly after the @interface: nsobject{} Parenthesis. </span></span></p></p><p><span style="word-wrap: break-word; color: #333333;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #0000ff;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;">< Span style= "word-wrap:break-word; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; Color: #008080; " >1<span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;"> @property (assign, <span style="word-wrap:break-word; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px; Color: #0000ff; ">readonly<span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;"> ) BOOL GAMECENTERAVAILABLE;<br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "><br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "></span></span></span></span></span></span></span></span></span></span></span></span></p><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;">You'll find that once you've defined the variables in the @interface, it's common to repeat the same variables in the @property.</span></span></p></p><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;">The result may be this:</span></span></p></p><p><span style="word-wrap: break-word; color: #333333;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #0000ff;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #008080;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #0000ff;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #b00000; word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><br style="word-wrap: break-word;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #0000ff;">@interface<span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;">Gcturnbasedmatchhelper:nsobject {<br style="word-wrap: break-word; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;">BOOL gamecenteravailable;<br style="word-wrap: break-word; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;">BOOL userauthenticated;<br style="word-wrap: break-word; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap:break-word; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;">}< BR style= "word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; " ><span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;"> @property (assign, <span style="word-wrap:break-word; font-family:tahoma, ' Microsoft yahei ', simsun; font-size: 14px; line-height:21px; Color: #0000ff; ">readonly<span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;"> ) BOOL GAMECENTERAVAILABLE;<br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "><br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><p style="word-wrap:break-word; margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:25px; text-align:left; "><span style="word-wrap:break-word; color: #333333;"><span style="font-family:verdana,arial,helvetica, sans-serif; word-wrap:break-word; "> and you can define variables individually in @interface without @property definitions, or you can just define them with @property, not in @interface, and of course @property to define them, usually in. m files with @ Synthsize to synthesize the corresponding Setter,getter method. Otherwise you will get a warning. Of course @synthsize is optional, but Apple recommended, no consequences, I have not tried, interested in Children's shoes can try. </span></span></p></p><p><span style="word-wrap: break-word; color: #333333;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #0000ff;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #008080;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #0000ff;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #b00000; word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px; color: #0000ff;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="word-wrap: break-word; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 21px;"><span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;">< Span style= "word-wrap:break-word; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; " ><span style="word-wrap:break-word; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;"> <span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;">< Span style= "word-wrap:break-word; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; Color: #0000ff; " ><span style="color: #444444; font-family:tahoma, ' Microsoft yahei ', simsun; font-size:14px; line-height:21px;"> <br style="word-wrap:break-word; Color: #444444; font-family:tahoma, ' Microsoft Yahei ', simsun; font-size:14px; line-height:21px; "></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;">What is the difference between these two ways?</span></span></p></p><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;">1. If you define variables only in @interface, the variables you define can only be accessed in the current class, not in other classes, and variables declared with @property may be accessed externally.</span></span></p></p><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><p style="word-wrap: break-word; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px; color: #444444; font-family: Tahoma,‘Microsoft Yahei‘,Simsun; font-size: 14px; line-height: 25px; text-align: left;"><span style="word-wrap: break-word; color: #333333;"><span style="font-family: verdana,Arial,Helvetica,sans-serif; word-wrap: break-word;">2. Using @property to declare variables, you can use the "SELF. variable name" method to read and write Variables. And the way to use @interface is not possible.</span></span></p></p><p><p>The difference between declaring a variable in a "go" ios,objective_c with a @interface and @property way</p></p></span>
