iOS开发--"performSelector may cause a leak because its selector is unknown"警告原因及其解决办法

今天编译时发现警告："performSelector
may cause a leak because its selector is unknown"

找到解决办法如下:

方法一:使用函数指针方式

SEL selector = NSSelectorFromString(@"someMethod");
IMP imp = [_controller methodForSelector:selector];
void (*func)(id, SEL) = (void *)imp;
func(_controller, selector);

当有额外参数时，如

SEL selector = NSSelectorFromString(@"processRegion:ofView:");
IMP imp = [_controller methodForSelector:selector];
CGRect (*func)(id, SEL, CGRect, UIView *) = (void *)imp;
CGRect result = func(_controller, selector, someRect, someView);

方法二:使用宏忽略警告

#define SuppressPerformSelectorLeakWarning(Stuff) \
do { \
_Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"") \
Stuff; \
_Pragma("clang diagnostic pop") \
} while (0)

在产生警告也就是

performSelector

的地方用使用该宏，如

SuppressPerformSelectorLeakWarning(
[_target performSelector:_action withObject:self]
);

如果需要

performSelector

返回值的话，

id result;
SuppressPerformSelectorLeakWarning(
result = [_target performSelector:_action withObject:self]
);