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Retrofitting containsString: on iOS 7
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#import <Foundation/Foundation.h> | |
#if __IPHONE_OS_VERSION_MIN_REQUIRED < 80000 | |
@interface NSString (PSPDFModernizer) | |
// Added in iOS 8, retrofitted for iOS 7 | |
- (BOOL)containsString:(NSString *)aString; | |
@end | |
#endif | |
// PSPDFModernizer.m | |
#import "PSPDFModernizer.h" | |
#import <objc/runtime.h> | |
#if __IPHONE_OS_VERSION_MIN_REQUIRED < 80000 | |
@implementation NSString (PSPDFModernizerCreator) | |
+ (void)load { | |
@autoreleasepool { | |
[self pspdf_modernizeSelector:NSSelectorFromString(@"containsString:") withSelector:@selector(pspdf_containsString:)]; | |
} | |
} | |
+ (void)pspdf_modernizeSelector:(SEL)originalSelector withSelector:(SEL)newSelector { | |
if (![NSString instancesRespondToSelector:originalSelector]) { | |
Method newMethod = class_getInstanceMethod(self, newSelector); | |
class_addMethod(self, originalSelector, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)); | |
} | |
} | |
// containsString: has been added in iOS 8. We dynamically add this if we run on iOS 7. | |
- (BOOL)pspdf_containsString:(NSString *)aString { | |
return [self rangeOfString:aString].location != NSNotFound; | |
} | |
@end | |
#endif |
I also remove warnings from compiling because method is not implemented:
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wincomplete-implementation"
@implementation NSString (ContainsString)
#pragma GCC diagnostic pop
...
@end
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@steipete You might want to update your blog post to reflect the changes ;-)