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Add option to prefetch low-resolution tiles #14031

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Mar 6, 2019
Merged

Add option to prefetch low-resolution tiles #14031

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9856a2d
Add option to prefetch low-resolution tiles
m-stephen Mar 5, 2019
23bbf58
Correct the value
m-stephen Mar 5, 2019
fa90a1b
Add change log, property getter and more clearly description.
m-stephen Mar 5, 2019
d7fffe1
Modify the descriptions
m-stephen Mar 5, 2019
a9cf5cb
Change log postion.
m-stephen Mar 5, 2019
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1 change: 1 addition & 0 deletions platform/ios/CHANGELOG.md
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Expand Up @@ -5,6 +5,7 @@ Mapbox welcomes participation and contributions from everyone. Please read [CONT
## master

* Client-side text rendering of CJK ideographs is now enabled by default. ([#13988](https://github.com/mapbox/mapbox-gl-native/pull/13988))
* Added an MGLMapView.prefetchesTiles property that you can disable if you don’t want to prefetch simplified tiles as a performance optimization. ([#14031](https://github.com/mapbox/mapbox-gl-native/pull/14031))
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Nit: the backticks help jazzy automatically link to the property’s documentation:

Suggested change
* Added an MGLMapView.prefetchesTiles property that you can disable if you don’t want to prefetch simplified tiles as a performance optimization. ([#14031](https://github.com/mapbox/mapbox-gl-native/pull/14031))
* Added an `MGLMapView.prefetchesTiles` property that you can disable if you don’t want to prefetch simplified tiles as a performance optimization. ([#14031](https://github.com/mapbox/mapbox-gl-native/pull/14031))


## 4.9.0 - February 27, 2019

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12 changes: 12 additions & 0 deletions platform/ios/src/MGLMapView.h
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Expand Up @@ -352,6 +352,18 @@ MGL_EXPORT IB_DESIGNABLE
*/
@property (nonatomic, assign) MGLMapViewPreferredFramesPerSecond preferredFramesPerSecond;

/**
A Boolean value indicating whether the map should prefetch tiles.

When this property is set to YES, the map view prefetches loads tiles designed for a
low zoom level and displays them until receiving more detailed tiles for the current
zoom level. The prefetched tiles typically contain simplified versions of each shape,
improving the map view’s perceived performance.

The default value of this property is YES.
*/
@property (nonatomic, assign) BOOL prefetchesTiles;

@property (nonatomic) NSArray<NSString *> *styleClasses __attribute__((unavailable("Support for style classes has been removed.")));

- (BOOL)hasStyleClass:(NSString *)styleClass __attribute__((unavailable("Support for style classes has been removed.")));
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8 changes: 8 additions & 0 deletions platform/ios/src/MGLMapView.mm
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Expand Up @@ -2630,6 +2630,14 @@ - (void)setShowsScale:(BOOL)showsScale
}
}

- (void)setPrefetchesTiles:(BOOL)prefetchesTiles{
_mbglMap->setPrefetchZoomDelta(prefetchesTiles ? mbgl::util::DEFAULT_PREFETCH_ZOOM_DELTA : 0);
}

- (BOOL)prefetchesTiles{
return _mbglMap->getPrefetchZoomDelta() > 0 ? YES : NO;
}

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#pragma mark - Accessibility -

- (NSString *)accessibilityValue
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