我正在动画一个按钮使用核心动画现在在某种情况下,我想停止该动画我如何停止动画?
这是为按钮设置动画的方法
-(void)animateButton:(UIButton *)btnName
{
CABasicAnimation *pulseAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
pulseAnimation.duration = .5;
pulseAnimation.toValue = [NSNumber numberWithFloat:1.1];
pulseAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
pulseAnimation.autoreverses = YES;
pulseAnimation.repeatCount = FLT_MAX;
[btnName.layer addAnimation:pulseAnimation forKey:nil];
}
Run Code Online (Sandbox Code Playgroud) 从网上下载图像并在UIImageView中显示它是相当容易的.但是,这需要在向用户显示图像之前完全下载图像,从而完全击败渐进式JPEG(和PNG)图像.
如何在传输过程中渲染部分下载的图像?我会想象SDK有一些回调函数可以更新图像,但我找不到这样的功能.使用当前的iOS SDK是否可行?
我有一个来自服务器的字符串,想检查它是否包含电话号码,邮件地址和电子邮件等表达式.我在电话号码和邮件地址方面取得了成功,但没有收到电子邮件.我是NSDataDetector
为了这个目的而使用的.例如
NSString *string = sourceNode.label; //coming from server
//Phone number
NSDataDetector *phoneDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypePhoneNumber error:nil];
NSArray *phoneMatches = [phoneDetector matchesInString:string options:0 range:NSMakeRange(0, [string length])];
for (NSTextCheckingResult *match in phoneMatches) {
if ([match resultType] == NSTextCheckingTypePhoneNumber) {
NSString *matchingStringPhone = [match description];
NSLog(@"found URL: %@", matchingStringPhone);
}
}
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但是如何为电子邮件做同样的事情呢?
我想知道下面的代码行是做什么的:
@property (assign, nonatomic) id <CoursePlannerDelegate> delegate;
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也就是说,我想知道这部分线路:
id <CoursePlannerDelegate> delegate;
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它也出现在其他地方:
@interface CategoryAddViewController : UIViewController {
UITextField *nameField, *weightField;
double maxWeight; //The maximum weight that can be allocated to this Category (max value of 100)
id <CategoryAddDelegate> delegate; //A Course Planner TVC
}
Run Code Online (Sandbox Code Playgroud) 我有以下代码:
driver.get(<some url>)
for element in driver.find_elements_by_class_name('thumbnail'):
element.find_element_by_xpath(".//a").click() #this works and navigates to new page
element.find_element_by_link_text('Click here').click() #this doesn't
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需要通过单击指向新页面的缩略图来导航以下HTML(当然简化),然后需要单击该Click here
新页面中的链接:
<!DOCTYPE html>
<html lang="en-US" prefix="og: http://iuytp.me/ns# fb: http://iuytp.me/ns/fb#">
<head>
<meta charset="UTF-8" />
<title>Releases</title>
</head>
<body class="archive category category-releases category-4 custom-background">
<div id="main">
<div id="container" class="one-column">
<div id="content" role="main">
<h1 class="page-title">Releases</h1>
<div id="thumbnail-post-display">
<div id="thumbnail-post" class="post-7158 post type-post status-publish format-standard has-post-thumbnail hentry category-blog category-designer category-releases category-uncategorized">
<div class="thumbnail"><a href="http://records.net/uncategorized/designer-7-inch-bufu-records-co-release/" title="Permanent link to Designer – 7 inch" rel="bookmark"><img width="300" …
Run Code Online (Sandbox Code Playgroud) Ey那里,正如标题所说,我很难将MKPolygon添加为MKMapView的叠加层.以下是相关代码:
ParkingMapViewContoller.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
@interface ParkingMapViewController : UIViewController <MKMapViewDelegate> {
MKMapView *mapView;
}
@property (nonatomic, retain) IBOutlet MKMapView *mapView;
-(void)loadAnnotations;
-(void)showCurrentLocationButtonTapped:(id)sender;
@end
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ParkingMapViewController.m
//...
#import "ParkingRegionOverlay.h"
//...
- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"%@",self.title);
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:100 target:self action:@selector(showCurrentLocationButtonTapped:)];
/*MKMapPoint points[3] = {{38.53607,-121.765793}, {38.537606,-121.768379}, {38.53487,-121.770578}};
MKPolygon *polygon = [MKPolygon polygonWithPoints:points count:3];*/
ParkingRegionOverlay *polygon = [[ParkingRegionOverlay alloc] initialize];
[mapView addOverlay:polygon];
[self loadAnnotations];
CLLocationCoordinate2D centerCoord = { UCD_LATITUDE, UCD_LONGITUDE };
[mapView setCenterCoordinate:centerCoord zoomLevel:13 animated:NO]; //from "MKMapView+ZoomLevel.h"
}
//...
- …
Run Code Online (Sandbox Code Playgroud) 我最近一直在询问有关UIToolbars的问题,但是现在我发现我需要以编程方式添加项目,我已经看到了其他人如何去做的方法,但是当我尝试做同样的事情时,没有什么最终出现.找出这个问题是我需要帮助的.以下是我在IB的关系:
以下是相关代码:
头文件:
#import <UIKit/UIKit.h>
@interface ParkingRootViewController : UIViewController {
UINavigationController *navigationController;
UIToolbar *toolbar;
UIBarButtonItem *lastUpdateLabel;
}
@property(nonatomic, retain) IBOutlet UINavigationController *navigationController;
@property (nonatomic, retain) IBOutlet UIToolbar *toolbar;
@property (nonatomic, retain) IBOutlet UIBarButtonItem *lastUpdateLabel;
- (IBAction)selectHome:(id)sender;
@end
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实施文件:
- (void)viewDidLoad {
[super viewDidLoad];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 150.0f, 20.0f)];
label.text = @"last updated...";
label.textColor = [UIColor colorWithWhite:1.0 alpha:1.0];
label.backgroundColor = [UIColor clearColor];
label.textAlignment = UITextAlignmentCenter;
label.font = [UIFont boldSystemFontOfSize:13.0];
label.userInteractionEnabled = NO;
lastUpdateLabel = [[UIBarButtonItem alloc] initWithCustomView:label]; …
Run Code Online (Sandbox Code Playgroud) Android模拟器可以模拟Camera设备(请参见屏幕截图),例如,我可以测试视频录制模块的工作方式:
那iOS模拟器呢?当我尝试运行使用相机的应用时,出现下一个错误
Thread 5: Fatal error: Unexpectedly found nil while unwrapping an Optional value
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在线
let videoDeviceInput = try AVCaptureDeviceInput(device: defaultVideoDevice!)
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所以没有模拟设备可用于iOS模拟器?
我是STAControls的维护者,该类继承了各种UIControl
s,其中一个是UISegmentedControl
。在该项目的示例应用程序中,我具有以下代码(可以从上述链接下载):
- (void)textFieldDidEndEditing:(UITextField *)textField {
NSInteger integer = [textField.text integerValue];
if (integer < 0 || integer >= self.segmentedControl.numberOfSegments) { this doesn't work
self.segmentedControl.selectedSegmentIndex = UISegmentedControlNoSegment;
} else { // this works
self.segmentedControl.selectedSegmentIndex = integer;
}
}
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在iOS 13中,UISegmentedControlNoSegment
不遵循分配:
在iOS 12和iOS的早期版本中,此功能可以正常运行:
有关如何解决此问题的任何想法?
下面的代码在IOS 5.0,6.0,6.1等上返回"YES",但在IOS 7.0上返回"NO".窦你对此有所了解吗?这是IOS 7.0的错误吗?非常感谢..
[view isKindOfClass:[SimpleLabel class]]
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PS:"SimpleLabel"是一个继承自UILabel的类.
---- ----更新
对不起,问题不明确.:(我在UITableViewCell
上课时使用上面的代码,并添加SimpleLabel
如下;
[self addSubview:label];
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我重写layoutSubviews
函数,循环self.subviews
,但[view class]
总是返回UITableViewCellScrollView
.
-(void)layoutSubviews {
[super layoutSubviews];
for (UIView*view in self.subviews) {
if ([view isKindOfClass:[SimpleLabel class]]) {
SimpleLabel*label = (SimpleLabel*)view;
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