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add an activity indicator to the preview view controller

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This commit is contained in:
Sami Samhuri 2015-05-09 18:12:01 -07:00
parent 0c9c8164e4
commit c4dfcb9039
2 changed files with 24 additions and 15 deletions
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10
Blog/Base.lproj/Main.storyboard
View file

@ -321,18 +321,23 @@ wanted with as little input and thought as possible.</string>
<rect key="frame" x="0.0" y="0.0" width="600" height="536"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<webView contentMode="scaleToFill" restorationIdentifier="Web View" translatesAutoresizingMaskIntoConstraints="NO" id="0n2-Ma-NtP">
<webView hidden="YES" contentMode="scaleToFill" restorationIdentifier="Web View" translatesAutoresizingMaskIntoConstraints="NO" id="0n2-Ma-NtP">
<rect key="frame" x="0.0" y="0.0" width="600" height="536"/>
<color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
<connections>
<outlet property="delegate" destination="ixd-IL-hNy" id="Alk-Fw-YWo"/>
</connections>
</webView>
<activityIndicatorView opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" hidesWhenStopped="YES" animating="YES" style="whiteLarge" translatesAutoresizingMaskIntoConstraints="NO" id="zNM-N6-tdC">
<rect key="frame" x="282" y="250" width="37" height="37"/>
</activityIndicatorView>
</subviews>
<color key="backgroundColor" red="0.1333333333" green="0.1333333333" blue="0.1333333333" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<constraints>
<constraint firstAttribute="centerX" secondItem="zNM-N6-tdC" secondAttribute="centerX" id="AgQ-RY-Y6c"/>
<constraint firstAttribute="centerX" secondItem="0n2-Ma-NtP" secondAttribute="centerX" id="Iad-IJ-UKT"/>
<constraint firstAttribute="centerY" secondItem="0n2-Ma-NtP" secondAttribute="centerY" id="cwx-9Q-nmc"/>
<constraint firstAttribute="centerY" secondItem="zNM-N6-tdC" secondAttribute="centerY" id="e25-K8-rET"/>
<constraint firstItem="0n2-Ma-NtP" firstAttribute="height" secondItem="d1U-C6-XQQ" secondAttribute="height" id="eZP-iJ-reC"/>
<constraint firstItem="0n2-Ma-NtP" firstAttribute="width" secondItem="d1U-C6-XQQ" secondAttribute="width" id="myh-gl-cb6"/>
</constraints>
@ -342,6 +347,7 @@ wanted with as little input and thought as possible.</string>
</navigationItem>
<simulatedStatusBarMetrics key="simulatedStatusBarMetrics" statusBarStyle="lightContent"/>
<connections>
<outlet property="indicatorView" destination="zNM-N6-tdC" id="aBl-qZ-1YS"/>
<outlet property="webView" destination="0n2-Ma-NtP" id="4yz-yf-YCI"/>
</connections>
</viewController>
@ -480,6 +486,6 @@ wanted with as little input and thought as possible.</string>
</scene>
</scenes>
<inferredMetricsTieBreakers>
<segue reference="6S0-TO-JiA"/>
<segue reference="Tll-UG-LXB"/>
</inferredMetricsTieBreakers>
</document>

29
Blog/PreviewViewController.m
View file

@ -11,6 +11,7 @@
@interface PreviewViewController () <UIWebViewDelegate>
@property (nonatomic, weak) IBOutlet UIWebView *webView;
@property (nonatomic, weak) IBOutlet UIActivityIndicatorView *indicatorView;
@end
@ -22,40 +23,42 @@
// UIWebView restores its request so we just have to reload it
if (!self.initialRequest && self.webView.request) {
[self.webView reload];
[self.indicatorView startAnimating];
return;
}
if (self.initialRequest) {
if (self.promise) {
__weak typeof(self) welf = self;
self.promise.then(^{
typeof(self) self = welf;
[self.webView loadRequest:self.initialRequest];
}).finally(^{
typeof(self) self = welf;
self.promise = nil;
});
return;
}
[self.webView loadRequest:self.initialRequest];
PMKPromise *p = self.promise ?: [PMKPromise promiseWithValue:nil];
__weak typeof(self) welf = self;
p.then(^{
typeof(self) self = welf;
[self.webView loadRequest:self.initialRequest];
[self.indicatorView startAnimating];
}).finally(^{
typeof(self) self = welf;
self.promise = nil;
});
return;
}
}
- (void)setInitialRequest:(NSURLRequest *)initialRequest {
_initialRequest = initialRequest;
[self.webView loadHTMLString:@"<!doctype html><html><head><title></title></head><body></body></html>" baseURL:nil];
self.webView.hidden = YES;
}
#pragma mark - UIWebViewDelegate methods
- (void)webViewDidFinishLoad:(UIWebView *)webView {
self.webView.hidden = NO;
[self.indicatorView stopAnimating];
if ([webView.request.URL isEqual:self.initialRequest.URL]) {
self.initialRequest = nil;
}
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
[self.indicatorView stopAnimating];
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Error" message:error.localizedDescription preferredStyle:UIAlertControllerStyleAlert];
__weak typeof(self) welf = self;
[alertController addAction:[UIAlertAction actionWithTitle:@"Dismiss" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {