IOS 关于取消延迟执行函数的种种。performSelector与cancelPreviousPerformRequestsWithTarget

print?<pre class=plain name="code">@interface nsobject (nsdelayedperforming) 
 
- (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay inmodes:(nsarray *)modes; 
- (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay; 
+ (void)cancelpreviousperformrequestswithtarget:(id)atarget selector:(sel)aselector object:(id)anargument; 
+ (void)cancelpreviousperformrequestswithtarget:(id)atarget; 
 
@end</pre><br> 
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<pre class=cpp name="code"></pre><pre class=cpp name="code" sizcache="1" sizset="5">最近看到大家对cancelpreviousperformrequestswithtarget不能取消带参数的<pre class=cpp name="code">- (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay;</pre>情况，写了一点点代码调试了一下，发现如果是带参数，那取消时的参数也要一致，否则不能取消成功。 
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<pre class=cpp name="code"></pre><pre class=cpp name="code">开始延迟执行：</pre><pre class=cpp name="code">[self performselector:@selector(didrunincurrmodel:) withobject:[nsnumber numberwithbool:yes] afterdelay:3.0f]; 
     
[self performselector:@selector(didrunincurrmodelnoargument) withobject:nil afterdelay:3.0f];</pre> 
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<p>假如在三秒内执行以下取消方法，则结果分别为：</p> 
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<pre class=cpp name="code">    [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:[nsnumber numberwithbool:yes]];//可以取消成功。  
     
    [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:[nsnumber numberwithbool:no]];//不能取消成功。参数不匹配  
     
    [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:nil];//不能取消成功。参数不匹配  
     
    [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodelnoargument) object:nil];//可以成功取消  
     
    [nsobject cancelpreviousperformrequestswithtarget:self];//可以成功取消全部。  
    [[self class] cancelpreviousperformrequestswithtarget:self];//可以成功取消全部。</pre>  
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[plain]
@interface nsobject (nsdelayedperforming)    - (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay inmodes:(nsarray *)modes;  - (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay;  + (void)cancelpreviousperformrequestswithtarget:(id)atarget selector:(sel)aselector object:(id)anargument;  + (void)cancelpreviousperformrequestswithtarget:(id)atarget;    @end  @interface nsobject (nsdelayedperforming)

- (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay inmodes:(nsarray *)modes;
- (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay;
+ (void)cancelpreviousperformrequestswithtarget:(id)atarget selector:(sel)aselector object:(id)anargument;
+ (void)cancelpreviousperformrequestswithtarget:(id)atarget;

@end

[cpp]
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最近看到大家对cancelpreviousperformrequestswithtarget不能取消带参数的<pre class=cpp name="code">- (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay;</pre>情况，写了一点点代码调试了一下，发现如果是带参数，那取消时的参数也要一致，否则不能取消成功。  <pre></pre>  <pre class=cpp name="code"></pre><pre class=cpp name="code">开始延迟执行：</pre><pre class=cpp name="code">[self performselector:@selector(didrunincurrmodel:) withobject:[nsnumber numberwithbool:yes] afterdelay:3.0f];        [self performselector:@selector(didrunincurrmodelnoargument) withobject:nil afterdelay:3.0f];</pre>  <p><br>  </p>  <p>假如在三秒内执行以下取消方法，则结果分别为：</p>  <p></p>  <pre class=cpp name="code">    [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:[nsnumber numberwithbool:yes]];//可以取消成功。             [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:[nsnumber numberwithbool:no]];//不能取消成功。参数不匹配             [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:nil];//不能取消成功。参数不匹配             [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodelnoargument) object:nil];//可以成功取消             [nsobject cancelpreviousperformrequestswithtarget:self];//可以成功取消全部。       [[self class] cancelpreviousperformrequestswithtarget:self];//可以成功取消全部。</pre>   <p></p>  <p><br>  </p>  <p><br>  </p>  <br>  <br>  <p><br>  </p>  <pre></pre>  <pre></pre>  最近看到大家对cancelpreviousperformrequestswithtarget不能取消带参数的[cpp] view plaincopyprint?- (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay;  - (void)performselector:(sel)aselector withobject:(id)anargument afterdelay:(nstimeinterval)delay;情况，写了一点点代码调试了一下，发现如果是带参数，那取消时的参数也要一致，否则不能取消成功。

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开始延迟执行：  开始延迟执行：
[cpp]
[self performselector:@selector(didrunincurrmodel:) withobject:[nsnumber numberwithbool:yes] afterdelay:3.0f];        [self performselector:@selector(didrunincurrmodelnoargument) withobject:nil afterdelay:3.0f];  [self performselector:@selector(didrunincurrmodel:) withobject:[nsnumber numberwithbool:yes] afterdelay:3.0f];
   
[self performselector:@selector(didrunincurrmodelnoargument) withobject:nil afterdelay:3.0f];

假如在三秒内执行以下取消方法，则结果分别为：

[cpp]  [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:[nsnumber numberwithbool:yes]];//可以取消成功。     [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:[nsnumber numberwithbool:no]];//不能取消成功。参数不匹配     [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:nil];//不能取消成功。参数不匹配     [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodelnoargument) object:nil];//可以成功取消     [nsobject cancelpreviousperformrequestswithtarget:self];//可以成功取消全部。   [[self class] cancelpreviousperformrequestswithtarget:self];//可以成功取消全部。      [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:[nsnumber numberwithbool:yes]];//可以取消成功。
   
    [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:[nsnumber numberwithbool:no]];//不能取消成功。参数不匹配
   
    [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodel:) object:nil];//不能取消成功。参数不匹配
   
    [nsobject cancelpreviousperformrequestswithtarget:self selector:@selector(didrunincurrmodelnoargument) object:nil];//可以成功取消
   
    [nsobject cancelpreviousperformrequestswithtarget:self];//可以成功取消全部。
    [[self class] cancelpreviousperformrequestswithtarget:self];//可以成功取消全部。