Forked from atomicbird/NSObject+setValuesForKeysWithJSONDictionary.h
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August 21, 2012 16:48
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NSObject category for handling JSON dictionaries. Described in detail at http://www.cimgf.com/2012/01/11/handling-incoming-json-redux/
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// | |
// NSObject+setValuesForKeysWithJSONDictionary.h | |
// SafeSetDemo | |
// | |
// Created by Tom Harrington on 12/29/11. | |
// Copyright (c) 2011 Atomic Bird, LLC. All rights reserved. | |
// | |
#import <Foundation/Foundation.h> | |
@interface NSObject (setValuesForKeysWithJSONDictionary) | |
- (void)setValuesForKeysWithJSONDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter; | |
@end |
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// | |
// NSObject+setValuesForKeysWithJSONDictionary.m | |
// SafeSetDemo | |
// | |
// Created by Tom Harrington on 12/29/11. | |
// Copyright (c) 2011 Atomic Bird, LLC. All rights reserved. | |
// | |
#import "NSObject+setValuesForKeysWithJSONDictionary.h" | |
#import <objc/runtime.h> | |
@implementation NSObject (setValuesForKeysWithJSONDictionary) | |
- (void)setValuesForKeysWithJSONDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter | |
{ | |
unsigned int propertyCount; | |
objc_property_t *properties = class_copyPropertyList([self class], &propertyCount); | |
/* | |
This code iterates over self's properties instead of ivars because the backing ivar might have a different name | |
than the property, for example if the class includes something like: | |
@synthesize foo = foo_; | |
In this case what we really want is "foo", not "foo_", since the incoming keys in keyedValues probably | |
don't have the underscore. Looking through properties gets "foo", looking through ivars gets "foo_". | |
*/ | |
for (int i=0; i<propertyCount; i++) { | |
objc_property_t property = properties[i]; | |
const char *propertyName = property_getName(property); | |
NSString *keyName = [NSString stringWithUTF8String:propertyName]; | |
// See if the property name is being supplied in the JSON dictionary. | |
id value = [keyedValues objectForKey:keyName]; | |
// If not, see if the backing ivar name is being supplied in the JSON dictionary. | |
if (value == nil) { | |
char *ivarPropertyName = property_copyAttributeValue(property, "V"); | |
NSString *ivarName = [NSString stringWithUTF8String:ivarPropertyName]; | |
value = [keyedValues objectForKey: ivarName]; | |
free(ivarPropertyName); | |
} | |
if (value != nil) { | |
char *typeEncoding = NULL; | |
typeEncoding = property_copyAttributeValue(property, "T"); | |
if (typeEncoding == NULL) { | |
continue; | |
} | |
switch (typeEncoding[0]) { | |
case '@': | |
{ | |
// Object | |
Class class = nil; | |
if (strlen(typeEncoding) >= 3) { | |
char *className = strndup(typeEncoding+2, strlen(typeEncoding)-3); | |
class = NSClassFromString([NSString stringWithUTF8String:className]); | |
free(className); | |
} | |
// Check for type mismatch, attempt to compensate | |
if ([class isSubclassOfClass:[NSString class]] && [value isKindOfClass:[NSNumber class]]) { | |
value = [value stringValue]; | |
} else if ([class isSubclassOfClass:[NSNumber class]] && [value isKindOfClass:[NSString class]]) { | |
// If the ivar is an NSNumber we really can't tell if it's intended as an integer, float, etc. | |
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; | |
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle]; | |
value = [numberFormatter numberFromString:value]; | |
[numberFormatter release]; | |
} else if ([class isSubclassOfClass:[NSDate class]] && [value isKindOfClass:[NSString class]] && (dateFormatter != nil)) { | |
value = [dateFormatter dateFromString:value]; | |
} | |
break; | |
} | |
case 'i': // int | |
case 's': // short | |
case 'l': // long | |
case 'q': // long long | |
case 'I': // unsigned int | |
case 'S': // unsigned short | |
case 'L': // unsigned long | |
case 'Q': // unsigned long long | |
case 'f': // float | |
case 'd': // double | |
case 'B': // BOOL | |
{ | |
if ([value isKindOfClass:[NSString class]]) { | |
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; | |
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle]; | |
value = [numberFormatter numberFromString:value]; | |
[numberFormatter release]; | |
} | |
break; | |
} | |
case 'c': // char | |
case 'C': // unsigned char | |
{ | |
if ([value isKindOfClass:[NSString class]]) { | |
char firstCharacter = [value characterAtIndex:0]; | |
value = [NSNumber numberWithChar:firstCharacter]; | |
} | |
break; | |
} | |
default: | |
{ | |
break; | |
} | |
} | |
[self setValue:value forKey:keyName]; | |
free(typeEncoding); | |
} | |
} | |
free(properties); | |
} | |
@end |
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// | |
// NSObject+setValuesForKeysWithJSONDictionary.h | |
// SafeSetDemo | |
// | |
// Created by Tom Harrington on 12/29/11. | |
// Copyright (c) 2011 Atomic Bird, LLC. All rights reserved. | |
// | |
#import <Foundation/Foundation.h> | |
@interface NSObject (setValuesForKeysWithJSONDictionary) | |
- (void)setValuesForKeysWithJSONDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter; | |
@end |
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// | |
// NSObject+setValuesForKeysWithJSONDictionary.m | |
// SafeSetDemo | |
// | |
// Created by Tom Harrington on 12/29/11. | |
// Copyright (c) 2011 Atomic Bird, LLC. All rights reserved. | |
// | |
#import "NSObject+setValuesForKeysWithJSONDictionary.h" | |
#import <objc/runtime.h> | |
@implementation NSObject (setValuesForKeysWithJSONDictionary) | |
- (void)setValuesForKeysWithJSONDictionary:(NSDictionary *)keyedValues dateFormatter:(NSDateFormatter *)dateFormatter | |
{ | |
unsigned int propertyCount; | |
objc_property_t *properties = class_copyPropertyList([self class], &propertyCount); | |
/* | |
This code iterates over self's properties instead of ivars because the backing ivar might have a different name | |
than the property, for example if the class includes something like: | |
@synthesize foo = foo_; | |
In this case what we really want is "foo", not "foo_", since the incoming keys in keyedValues probably | |
don't have the underscore. Looking through properties gets "foo", looking through ivars gets "foo_". | |
*/ | |
for (int i=0; i<propertyCount; i++) { | |
objc_property_t property = properties[i]; | |
const char *propertyName = property_getName(property); | |
NSString *keyName = [NSString stringWithUTF8String:propertyName]; | |
// See if the property name is being supplied in the JSON dictionary. | |
id value = [keyedValues objectForKey:keyName]; | |
// If not, see if the backing ivar name is being supplied in the JSON dictionary. | |
if (value == nil) { | |
const char *ivarPropertyName = property_copyAttributeValue(property, "V"); | |
NSString *ivarName = [NSString stringWithUTF8String:ivarPropertyName]; | |
value = [keyedValues objectForKey: ivarName]; | |
free(ivarName); | |
} | |
if (value != nil) { | |
char *typeEncoding = NULL; | |
typeEncoding = property_copyAttributeValue(property, "T"); | |
if (typeEncoding == NULL) { | |
continue; | |
} | |
switch (typeEncoding[0]) { | |
case '@': | |
{ | |
// Object | |
Class class = nil; | |
if (strlen(typeEncoding) >= 3) { | |
char *className = strndup(typeEncoding+2, strlen(typeEncoding)-3); | |
class = NSClassFromString([NSString stringWithUTF8String:className]); | |
free(className); | |
} | |
// Check for type mismatch, attempt to compensate | |
if ([class isSubclassOfClass:[NSString class]] && [value isKindOfClass:[NSNumber class]]) { | |
value = [value stringValue]; | |
} else if ([class isSubclassOfClass:[NSNumber class]] && [value isKindOfClass:[NSString class]]) { | |
// If the ivar is an NSNumber we really can't tell if it's intended as an integer, float, etc. | |
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; | |
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle]; | |
value = [numberFormatter numberFromString:value]; | |
[numberFormatter release]; | |
} else if ([class isSubclassOfClass:[NSDate class]] && [value isKindOfClass:[NSString class]] && (dateFormatter != nil)) { | |
value = [dateFormatter dateFromString:value]; | |
} | |
break; | |
} | |
case 'i': // int | |
case 's': // short | |
case 'l': // long | |
case 'q': // long long | |
case 'I': // unsigned int | |
case 'S': // unsigned short | |
case 'L': // unsigned long | |
case 'Q': // unsigned long long | |
case 'f': // float | |
case 'd': // double | |
case 'B': // BOOL | |
{ | |
if ([value isKindOfClass:[NSString class]]) { | |
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; | |
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle]; | |
value = [numberFormatter numberFromString:value]; | |
[numberFormatter release]; | |
} | |
break; | |
} | |
case 'c': // char | |
case 'C': // unsigned char | |
{ | |
if ([value isKindOfClass:[NSString class]]) { | |
char firstCharacter = [value characterAtIndex:0]; | |
value = [NSNumber numberWithChar:firstCharacter]; | |
} | |
break; | |
} | |
default: | |
{ | |
break; | |
} | |
} | |
[self setValue:value forKey:keyName]; | |
free(typeEncoding); | |
} | |
} | |
free(properties); | |
} | |
@end |
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