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PCPropertyObserver
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| // © 2011-2014 Phillip N. Calvin, James Coleman | |
| // For use in a setter. | |
| // Signs up self to receive KVO notifications about given properties | |
| // on any new value and removes self as an observer from the old value. | |
| // For example, to observe properties of a property called customer | |
| // (backed by ivar _customer): | |
| // PCPropertyObserver(customer, @"allowSubscriptionPurchase", @"availableProducts"); | |
| // You'd need to write this selector yourself: | |
| // - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { | |
| // if ([keyPath isEqualToString:@"availableProducts"] || | |
| // [keyPath isEqualToString:@"allowSubscriptionPurchase"]) { | |
| // // Handle change to key | |
| // } | |
| // } | |
| // KVO Path Safety: | |
| // | |
| // The PCKVOCheckedProperties(...) and PCKVOCheckedProperty(key) macros can | |
| // be used to implement compiler warnings for attempts to use KVO to bind to | |
| // non-existent properties (such as a typoed property name.) | |
| // | |
| // You may also use the macros to provided similar safety in your implementation of | |
| // `observeValueForKeyPath:ofObject:change:context:`. | |
| // | |
| // For example, to safely observe properties of a property called customer:: | |
| // PCPropertyObserver(customer, PCKVOCheckedProperties(allowSubscriptionPurchase, availableProducts)); | |
| // | |
| // Note: You must have Clang configured to warn on Undeclared Selector usage and define DEBUG=1. | |
| #ifndef PC_PROPERTY_OBSERVER | |
| #define PC_PROPERTY_OBSERVER | |
| #if DEBUG | |
| #define PCKVOCheckedProperty(key) NSStringFromSelector(@selector(key)) | |
| #else | |
| #define PCKVOCheckedProperty(key) @#key | |
| #endif | |
| #define PC_KVO_CHECKED_PROPERTY_1(_1) PCKVOCheckedProperty(_1) | |
| #define PC_KVO_CHECKED_PROPERTY_2(_1, _2) PC_KVO_CHECKED_PROPERTY_1(_1), PCKVOCheckedProperty(_2) | |
| #define PC_KVO_CHECKED_PROPERTY_3(_1, _2, _3) PC_KVO_CHECKED_PROPERTY_2(_1, _2), PCKVOCheckedProperty(_3) | |
| #define PC_KVO_CHECKED_PROPERTY_4(_1, _2, _3, _4) PC_KVO_CHECKED_PROPERTY_3(_1, _2, _3), PCKVOCheckedProperty(_4) | |
| #define PC_KVO_CHECKED_PROPERTY_5(_1, _2, _3, _4, _5) PC_KVO_CHECKED_PROPERTY_4(_1, _2, _3, _4), PCKVOCheckedProperty(_5) | |
| #define PC_KVO_CHECKED_PROPERTY_6(_1, _2, _3, _4, _5, _6) PC_KVO_CHECKED_PROPERTY_5(_1, _2, _3, _4, _5), PCKVOCheckedProperty(_6) | |
| #define PC_KVO_CHECKED_PROPERTY_7(_1, _2, _3, _4, _5, _6, _7) PC_KVO_CHECKED_PROPERTY_6(_1, _2, _3, _4, _5, _6), PCKVOCheckedProperty(_7) | |
| #define PC_KVO_CHECKED_PROPERTY_8(_1, _2, _3, _4, _5, _6, _7, _8) PC_KVO_CHECKED_PROPERTY_7(_1, _2, _3, _4, _5, _6, _7), PCKVOCheckedProperty(_8) | |
| #define PC_KVO_CHECKED_PROPERTY_9(_1, _2, _3, _4, _5, _6, _7, _8, _9) PC_KVO_CHECKED_PROPERTY_8(_1, _2, _3, _4, _5, _6, _7, _8), PCKVOCheckedProperty(_9) | |
| #define PC_KVO_CHECKED_PROPERTY_10(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10) PC_KVO_CHECKED_PROPERTY_9(_1, _2, _3, _4, _5, _6, _7, _8, _9), PCKVOCheckedProperty(_10) | |
| #define PC_KVO_CHECKED_PROPERTY_11(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) PC_KVO_CHECKED_PROPERTY_10(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10), PCKVOCheckedProperty(_11) | |
| #define PC_KVO_CHECKED_PROPERTY_12(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) PC_KVO_CHECKED_PROPERTY_11(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11), PCKVOCheckedProperty(_12) | |
| #define PC_KVO_CHECKED_PROPERTY_13(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) PC_KVO_CHECKED_PROPERTY_12(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12), PCKVOCheckedProperty(_13) | |
| #define PC_KVO_CHECKED_PROPERTY_14(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) PC_KVO_CHECKED_PROPERTY_13(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13), PCKVOCheckedProperty(_14) | |
| #define PC_KVO_CHECKED_PROPERTY_15(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) PC_KVO_CHECKED_PROPERTY_14(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14), PCKVOCheckedProperty(_15) | |
| #define PC_KVO_CHECKED_PROPERTY_16(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) PC_KVO_CHECKED_PROPERTY_15(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15), PCKVOCheckedProperty(_16) | |
| #define PC_KVO_CHECKED_PROPERTY_17(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17) PC_KVO_CHECKED_PROPERTY_16(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16), PCKVOCheckedProperty(_17) | |
| #define PC_KVO_CHECKED_PROPERTY_18(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18) PC_KVO_CHECKED_PROPERTY_17(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17), PCKVOCheckedProperty(_18) | |
| #define PC_KVO_CHECKED_PROPERTY_19(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19) PC_KVO_CHECKED_PROPERTY_18(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18), PCKVOCheckedProperty(_19) | |
| #define PC_KVO_CHECKED_PROPERTY_20(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20) PC_KVO_CHECKED_PROPERTY_19(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19), PCKVOCheckedProperty(_20) | |
| #define PC_KVO_CHECKED_PROPERTY_21(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21) PC_KVO_CHECKED_PROPERTY_20(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20), PCKVOCheckedProperty(_21) | |
| #define PC_KVO_CHECKED_PROPERTY_22(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22) PC_KVO_CHECKED_PROPERTY_21(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21), PCKVOCheckedProperty(_22) | |
| #define PC_KVO_CHECKED_PROPERTY_23(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23) PC_KVO_CHECKED_PROPERTY_22(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22), PCKVOCheckedProperty(_23) | |
| #define PC_KVO_CHECKED_PROPERTY_24(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24) PC_KVO_CHECKED_PROPERTY_23(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23), PCKVOCheckedProperty(_24) | |
| #define PC_KVO_CHECKED_PROPERTY_25(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25) PC_KVO_CHECKED_PROPERTY_24(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24), PCKVOCheckedProperty(_25) | |
| #define PC_KVO_CHECKED_PROPERTY_26(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26) PC_KVO_CHECKED_PROPERTY_25(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25), PCKVOCheckedProperty(_26) | |
| #define PC_KVO_CHECKED_PROPERTY_27(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27) PC_KVO_CHECKED_PROPERTY_26(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26), PCKVOCheckedProperty(_27) | |
| #define PC_KVO_CHECKED_PROPERTY_28(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28) PC_KVO_CHECKED_PROPERTY_27(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27), PCKVOCheckedProperty(_28) | |
| #define PC_KVO_CHECKED_PROPERTY_29(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29) PC_KVO_CHECKED_PROPERTY_28(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28), PCKVOCheckedProperty(_29) | |
| #define PC_KVO_CHECKED_PROPERTY_30(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30) PC_KVO_CHECKED_PROPERTY_29(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29), PCKVOCheckedProperty(_30) | |
| #define PC_KVO_CHECKED_PROPERTY_31(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, _31) PC_KVO_CHECKED_PROPERTY_30(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30), PCKVOCheckedProperty(_31) | |
| #define PC_KVO_CHECKED_PROPERTY_32(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, _31, _32) PC_KVO_CHECKED_PROPERTY_31(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, _31), PCKVOCheckedProperty(_32) | |
| #define PC_GET_KVO_CHECKED_PROPERTY_MACRO_NAME(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, _31, _32, NAME, ...) NAME | |
| #define PCKVOCheckedProperties(...) PC_GET_KVO_CHECKED_PROPERTY_MACRO_NAME(__VA_ARGS__, PC_KVO_CHECKED_PROPERTY_32, PC_KVO_CHECKED_PROPERTY_31, PC_KVO_CHECKED_PROPERTY_30, PC_KVO_CHECKED_PROPERTY_29, PC_KVO_CHECKED_PROPERTY_28, PC_KVO_CHECKED_PROPERTY_27, PC_KVO_CHECKED_PROPERTY_26, PC_KVO_CHECKED_PROPERTY_25, PC_KVO_CHECKED_PROPERTY_24, PC_KVO_CHECKED_PROPERTY_23, PC_KVO_CHECKED_PROPERTY_22, PC_KVO_CHECKED_PROPERTY_21, PC_KVO_CHECKED_PROPERTY_20, PC_KVO_CHECKED_PROPERTY_19, PC_KVO_CHECKED_PROPERTY_18, PC_KVO_CHECKED_PROPERTY_17, PC_KVO_CHECKED_PROPERTY_16, PC_KVO_CHECKED_PROPERTY_15, PC_KVO_CHECKED_PROPERTY_14, PC_KVO_CHECKED_PROPERTY_13, PC_KVO_CHECKED_PROPERTY_12, PC_KVO_CHECKED_PROPERTY_11, PC_KVO_CHECKED_PROPERTY_10, PC_KVO_CHECKED_PROPERTY_9, PC_KVO_CHECKED_PROPERTY_8, PC_KVO_CHECKED_PROPERTY_7, PC_KVO_CHECKED_PROPERTY_6, PC_KVO_CHECKED_PROPERTY_5, PC_KVO_CHECKED_PROPERTY_4, PC_KVO_CHECKED_PROPERTY_3, PC_KVO_CHECKED_PROPERTY_2, PC_KVO_CHECKED_PROPERTY_1)(__VA_ARGS__) | |
| #define PCPropertyObserverWithFlags(property, flags, args...) \ | |
| NSArray *observedProperties;\ | |
| if (_ ## property != nil || property != nil) { \ | |
| observedProperties = @[ args ]; \ | |
| } \ | |
| if (_ ## property != nil) { \ | |
| for (NSString *key in observedProperties) { \ | |
| [_ ## property removeObserver:self forKeyPath:key]; \ | |
| } \ | |
| } \ | |
| _ ## property = property; \ | |
| if (property != nil) { \ | |
| for (NSString *key in observedProperties) { \ | |
| [property addObserver:self forKeyPath:key options:flags context:nil]; \ | |
| } \ | |
| } | |
| #define PCPropertyObserver(property, args...) \ | |
| PCPropertyObserverWithFlags(property, NSKeyValueObservingOptionNew | NSKeyValueObservingOptionInitial, args); | |
| #endif |
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