[CRD iOS] Finish up the host list UI

remoting/ios/app/host_collection_header_view.mm

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#import "remoting/ios/app/host_collection_header_view.h"
+
+#import <UIKit/UIKit.h>
+
+#import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
+
+// Applied on the left and right of the label.
+static const float kTitleMargin = 12.f;
+
+@interface HostCollectionHeaderView () {
+ @private
+  UILabel* _titleLabel;
+}
+@end
+
+@implementation HostCollectionHeaderView
+
+- (instancetype)initWithFrame:(CGRect)frame {
+  self = [super initWithFrame:frame];
+  if (self) {
+    _titleLabel = [[UILabel alloc] init];
+    _titleLabel.font = [MDCTypography body2Font];
+    _titleLabel.textColor = [UIColor whiteColor];
+    _titleLabel.backgroundColor = [UIColor clearColor];
+    _titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
+    [self addSubview:_titleLabel];
+
+    [NSLayoutConstraint activateConstraints:@[
+      [[_titleLabel leadingAnchor] constraintEqualToAnchor:[self leadingAnchor]
+                                                  constant:kTitleMargin],
+      [[_titleLabel centerYAnchor]
+          constraintEqualToAnchor:[self centerYAnchor]],
+      [[_titleLabel trailingAnchor]
+          constraintEqualToAnchor:[self trailingAnchor]
+                         constant:-kTitleMargin],
+    ]];
+  }
+  return self;
+}
+
+- (NSString*)text {
+  return _titleLabel.text;
+}
+
+- (void)setText:(NSString*)text {
+  _titleLabel.text = text;
+}
+
+@end