问题
采用以下方法时会提示【performSelector may cause a leak because its selector is unknown】警告
代码语言：txt复制[_controller performSelector:NSSelectorFromString(@"someMethod")];解决方案
可采用以下方法消除
代码语言：txt复制if (!_controller) { return; }
SEL selector = NSSelectorFromString(@"someMethod");
IMP imp = [_controller methodForSelector:selector];
void (*func)(id, SEL) = (void *)imp;
func(_controller, selector);如果 selector 接收参数，或者有返回值，代码就改为如下：
代码语言：txt复制SEL selector = NSSelectorFromString(@"processRegion:ofView:");
IMP imp = [_controller methodForSelector:selector];
CGRect (*func)(id, SEL, CGRect, UIView *) = (void *)imp;
CGRect result = _controller ?
func(_controller, selector, someRect, someView) : CGRectZero;原文地址：https://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown
