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8e70c7f003
Summary: This PR adds 4 native events to NetworkImage.  Using these events I could wrap `Image` component into something like: ```javascript class NetworkImage extends React.Component { getInitialState() { return { downloading: false, progress: 0 } } render() { var loader = this.state.downloading ? <View style={this.props.loaderStyles}> <ActivityIndicatorIOS animating={true} size={'large'} /> <Text style={{color: '#bbb'}}>{this.state.progress}%</Text> </View> : null; return <Image source={this.props.source} onLoadStart={() => this.setState({downloading: true}) } onLoaded={() => this.setState({downloading: false}) } onLoadProgress={(e)=> this.setState({progress: Math.round(100 * e.nativeEvent.written / e.nativeEvent.total)}); onLoadError={(e)=> { alert('the image cannot be downloaded because: ', JSON.stringify(e)); this.setState({downloading: false}); }}> {loader} </Image> } } ``` Useful on slow connections and server errors. There are dozen lines of Objective C, which I don't have experience with. There are neither specific tests nor documentation yet. And I do realize that you're already working right now on better `<Image/>` (pipeline, new asset management, etc.). So this is basically a proof concept of events for images, and if this idea is not completely wrong I could improve it or help somehow. Closes https://github.com/facebook/react-native/pull/1318 Github Author: Dmitriy Loktev <unknownliveid@hotmail.com>
42 lines
1.5 KiB
Objective-C
42 lines
1.5 KiB
Objective-C
/**
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* Copyright (c) 2015-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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#import <UIKit/UIKit.h>
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@class RCTEventDispatcher;
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@class RCTImageDownloader;
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@interface RCTNetworkImageView : UIView
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- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
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imageDownloader:(RCTImageDownloader *)imageDownloader NS_DESIGNATED_INITIALIZER;
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/**
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* An image that will appear while the view is loading the image from the network,
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* or when imageURL is nil. Defaults to nil.
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*/
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@property (nonatomic, strong) UIImage *defaultImage;
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/**
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* Specify a URL for an image. The image will be asynchronously loaded and displayed.
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*/
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@property (nonatomic, strong) NSURL *imageURL;
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/**
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* By default, changing imageURL will reset whatever existing image was present
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* and revert to defaultImage while the new image loads. In certain obscure cases you
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* may want to disable this behavior and instead keep displaying the previous image
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* while the new one loads. In this case, pass NO for resetToDefaultImageWhileLoading.
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* (If you set imageURL to nil, however, resetToDefaultImageWhileLoading is ignored;
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* that will always reset to the default image.)
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*/
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- (void)setImageURL:(NSURL *)imageURL resetToDefaultImageWhileLoading:(BOOL)reset;
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@end
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