构建SEL RUNTIME调用步骤

构建SEL RUNTIME调用方法

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??? for (int i = 1; i< 3; i++) {
??????? SEL customSelector = NSSelectorFromString([NSString stringWithFormat:@"update%d", i]);
??????? if ([self respondsToSelector:customSelector]) {
???????????? [self performSelector:customSelector];
??????? }
??? }