在調(diào)用performSelector的時(shí)候Xcode總是會(huì)多出一條警告，看著就別扭
performSelector may cause a leak because its selector is unknown
那么怎么解決呢骑脱？
1唠倦、宏編譯忽略它
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
[self performSelector:@selector(methodName) withObject:parameter];
#pragma clang diagnostic pop
2称鳞、推薦做法，分四種情況稠鼻，寫法一看便明白了
/// 無參無返回值
SEL selector = NSSelectorFromString(@"method");
IMP imp = [object methodForSelector:selector];
void (*func)(id, SEL) = (void *)imp;
func(object, selector);
/// 有參有返回值
SEL selector = NSSelectorFromString(@"method: parameter1: parameter2");
IMP imp = [object methodForSelector:selector];
CGRect (*func)(id, SEL, CGRect, UIView *) = (void *)imp;
CGRect result = func(object, selector, p1, p2);
/// 有參無返回值
SEL selector = NSSelectorFromString(@"method: parameter1");
IMP imp = [object methodForSelector:selector];
void (*func)(id, SEL, CGFloat) = (void *)imp;
func(object, selector, p1);
/// 無參有返回值
SEL selector = NSSelectorFromString(@"method");
IMP imp = [object methodForSelector:selector];
BOOL (*func)(id, SEL) = (void *)imp;
BOOL result = func(object, selector);
