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79 lines
2.0 KiB
Plaintext
79 lines
2.0 KiB
Plaintext
/*
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* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#import "ASInternalHelpers.h"
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#import <functional>
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#import <objc/runtime.h>
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#import "ASLayout.h"
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BOOL ASSubclassOverridesSelector(Class superclass, Class subclass, SEL selector)
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{
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Method superclassMethod = class_getInstanceMethod(superclass, selector);
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Method subclassMethod = class_getInstanceMethod(subclass, selector);
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IMP superclassIMP = superclassMethod ? method_getImplementation(superclassMethod) : NULL;
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IMP subclassIMP = subclassMethod ? method_getImplementation(subclassMethod) : NULL;
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return (superclassIMP != subclassIMP);
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}
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static void ASDispatchOnceOnMainThread(dispatch_once_t *predicate, dispatch_block_t block)
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{
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if ([NSThread isMainThread]) {
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dispatch_once(predicate, block);
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} else {
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if (DISPATCH_EXPECT(*predicate == 0L, NO)) {
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dispatch_sync(dispatch_get_main_queue(), ^{
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dispatch_once(predicate, block);
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});
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}
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}
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}
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CGFloat ASScreenScale()
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{
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static CGFloat _scale;
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static dispatch_once_t onceToken;
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ASDispatchOnceOnMainThread(&onceToken, ^{
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_scale = [UIScreen mainScreen].scale;
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});
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return _scale;
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}
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CGFloat ASFloorPixelValue(CGFloat f)
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{
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return floorf(f * ASScreenScale()) / ASScreenScale();
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}
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CGFloat ASCeilPixelValue(CGFloat f)
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{
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return ceilf(f * ASScreenScale()) / ASScreenScale();
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}
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CGFloat ASRoundPixelValue(CGFloat f)
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{
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return roundf(f * ASScreenScale()) / ASScreenScale();
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}
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BOOL ASSystemVersionLessThan8()
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{
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static BOOL lessThan8;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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lessThan8 = ASSystemVersionLessThanVersion(@"8");
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});
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return lessThan8;
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}
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BOOL ASSystemVersionLessThanVersion(NSString *version)
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{
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return [[[UIDevice currentDevice] systemVersion] compare:version options:NSNumericSearch] == NSOrderedAscending;
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}
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