IOS编译警告之:performSelector may cause a leak because its selector is unknown
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解决方案:
#pragma clang diagnostic push#pragma clang diagnostic ignored "-Warc-performSelector-leaks" [self.ticketTarget performSelector: self.ticketAction withObject: self];#pragma clang diagnostic pop
如果多次用到请使用宏定义
#define SuppressPerformSelectorLeakWarning(Stuff) \ do { \ _Pragma("clang diagnostic push") \ _Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"") \ Stuff; \ _Pragma("clang diagnostic pop") \ } while (0)
使用方法
SuppressPerformSelectorLeakWarning( [_target performSelector:_action withObject:self]);
如果有返回参数
id result;SuppressPerformSelectorLeakWarning( result = [_target performSelector:_action withObject:self]);
原因:
stackoverflow 的原因很负责说了很多 我简单的说一下
oc方法调用时就是这样的一个情况
if (!_controller) { return; }SEL selector = NSSelectorFromString(@"someMethod");IMP imp = [_controller methodForSelector:selector];void (*func)(id, SEL) = (void *)imp;func(_controller, selector);
简而言之 就是一个IMP函数指针的事情
IMP (id (*IMP)(id, SEL, …)) 函数指针
oc 编译的时候会转换成c语言,其实 这个函数调用本身是没问题的。
但是oc中添加了arc ,arc的存在就需要知道函数的返回值情况(需要在合适的位置加上retain release)。而报警告就是因为编译器无法直接找到函数的详细情况(可能调用了私有函数)。如果编译器无法知道返回值,就会进行猜测。你说你写了一个方法 ,让编译器去猜返回值情况(猜错了会造成内存泄露),它当然会报警告。其实手动管理中,是没有的 。因为手动管理内存,编译器又不用管,你去管就好了,arc中报警告,而在swift中都不会让你通过。。。。
clang编译器所有警告:http://fuckingclangwarnings.com/
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