113 lines
3.9 KiB
Objective-C
113 lines
3.9 KiB
Objective-C
/*
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Copyright (c) 2015, Apple Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. Neither the name of the copyright holder(s) nor the names of any contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission. No license is granted to the trademarks of
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the copyright holders even if such marks are included in this software.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#import "ORKObserver.h"
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#import "ORKHelpers_Internal.h"
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@implementation ORKObserver
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+ (instancetype)new {
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ORKThrowMethodUnavailableException();
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}
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- (instancetype)init {
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ORKThrowMethodUnavailableException();
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}
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- (instancetype)initWithTarget:(id)target keyPaths:(NSArray *)keyPaths delegate:(id)delegate action:(SEL)action context:(void *)context {
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self = [super init];
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if (self) {
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self.keyPaths = keyPaths;
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self.target = target;
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self.delegate = delegate;
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self.action = action;
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self.context = context;
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[self startObserving];
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}
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return self;
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}
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- (void)observeValueForKeyPath:(NSString *)keyPath
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ofObject:(id)object
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change:(NSDictionary *)change
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context:(void *)context {
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NSAssert(context == self.context, @"Unexpected KVO");
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ORKSuppressPerformSelectorWarning(
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(void)[self.delegate performSelector:self.action withObject:self.target];
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);
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}
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- (void)startObserving {
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if (_observing == NO) {
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NSAssert(self.keyPaths, @"");
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NSAssert(self.target, @"");
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NSAssert(self.context, @"");
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NSAssert(self.delegate, @"");
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NSAssert(self.action, @"");
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for (NSString *keyPath in self.keyPaths) {
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[self.target addObserver:self forKeyPath:keyPath options:(NSKeyValueObservingOptions)0 context:self.context];
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}
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self.observing = YES;
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}
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}
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- (void)stopObserving {
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if (_observing) {
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for (NSString *keyPath in _keyPaths) {
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[self.target removeObserver:self forKeyPath:keyPath];
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}
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_observing = NO;
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}
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}
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- (void)dealloc {
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[self stopObserving];
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}
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@end
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@implementation ORKScrollViewObserver
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static void *_ORKScrollViewObserverContext = &_ORKScrollViewObserverContext;
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- (instancetype)initWithTargetView:(UIScrollView *)scrollView delegate:(id <ORKScrollViewObserverDelegate>)delegate {
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return [super initWithTarget:scrollView
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keyPaths:@[ @"contentOffset" ]
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delegate:delegate
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action:@selector(observedScrollViewDidScroll:)
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context:_ORKScrollViewObserverContext];
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}
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@end
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