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iOS知识小集-170529

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Open system wifi settings

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"App-Prefs:root=WIFI"]];

UITextField

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-(void)setupTextField{
  self.wifiNameTF =
      [[UITextField alloc] initWithFrame:CGRectMake(kScaleFrom_iPhone6_Desgin(16), 0,
                                                    self.view.bounds.size.width - kScaleFrom_iPhone6_Desgin(32),
                                                    kScaleFrom_iPhone6_Desgin(54))];
  self.wifiNameTF.placeholder = @"请输入Wi-Fi名称";
  self.wifiNameTF.font = [UIFont systemFontOfSize:kScaleFrom_iPhone6_Desgin(16)];
  self.wifiNameTF.textColor = UIColorFromRGBA(0xff16181d);
  self.wifiNameTF.clearButtonMode = UITextFieldViewModeWhileEditing;
  self.wifiNameTF.autocapitalizationType = UITextAutocapitalizationTypeNone;
  self.wifiNameTF.returnKeyType = UIReturnKeyDone;
  self.wifiNameTF.delegate = self;
  self.wifiNameTF.secureTextEntry = YES;
  self.wifiNameTF.rightView = secureBtn;
  self.wifiNameTF.rightViewMode = UITextFieldViewModeAlways;
  [self.view addSubview:self.wifiNameTF];
}

Gradient flow animation

两倍长度，添加左右移动动画，并添加左右两边覆盖层。

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  //  progress bar
  self.progressBar =
      [[UIView alloc] initWithFrame:CGRectMake((self.view.bounds.size.width - kScaleFrom_iPhone6_Desgin(120)) / 2,
                                               kScaleFrom_iPhone6_Desgin(360), kScaleFrom_iPhone6_Desgin(120),
                                               kScaleFrom_iPhone6_Desgin(4))];
  [self.view addSubview:self.progressBar];
  self.gradientLayer = [CAGradientLayer layer];
  self.gradientLayer.frame =
      CGRectMake(-kScaleFrom_iPhone6_Desgin(120), 0, kScaleFrom_iPhone6_Desgin(240), kScaleFrom_iPhone6_Desgin(4));
  self.gradientLayer.locations = @[ @0, @0.15, @0.3, @0.5, @0.65, @0.8, @1 ];
  self.gradientLayer.colors = @[
    (__bridge id)UIColorFromRGBA(0xff1af28f)
        .CGColor,
    (__bridge id)UIColorFromRGBA(0xff0de9c5).CGColor,
    (__bridge id)UIColorFromRGBA(0xff3293fe).CGColor,
    (__bridge id)UIColorFromRGBA(0xff1af28f).CGColor,
    (__bridge id)UIColorFromRGBA(0xff0de9c5).CGColor,
    (__bridge id)UIColorFromRGBA(0xff3293fe).CGColor,
    (__bridge id)UIColorFromRGBA(0xff1af28f).CGColor
  ];
  self.gradientLayer.startPoint = CGPointMake(0, 0);
  self.gradientLayer.endPoint = CGPointMake(1, 0);
  [self.progressBar.layer addSublayer:self.gradientLayer];
  CALayer *leftMask = [CALayer layer];
  leftMask.frame =
      CGRectMake(-kScaleFrom_iPhone6_Desgin(120), 0, kScaleFrom_iPhone6_Desgin(120), kScaleFrom_iPhone6_Desgin(4));
  leftMask.backgroundColor = [UIColor whiteColor].CGColor;
  [self.progressBar.layer addSublayer:leftMask];
  CALayer *rightMask = [CALayer layer];
  rightMask.frame =
      CGRectMake(kScaleFrom_iPhone6_Desgin(120), 0, kScaleFrom_iPhone6_Desgin(120), kScaleFrom_iPhone6_Desgin(4));
  rightMask.backgroundColor = [UIColor whiteColor].CGColor;
  [self.progressBar.layer addSublayer:rightMask];
  CABasicAnimation *moveAnimation = [CABasicAnimation animationWithKeyPath:@"position.x"];
  moveAnimation.fromValue = @(self.gradientLayer.position.x);
  moveAnimation.toValue = @(self.gradientLayer.position.x + kScaleFrom_iPhone6_Desgin(120));
  moveAnimation.repeatCount = 100;
  moveAnimation.duration = 2;
  moveAnimation.autoreverses = NO;
  [self.gradientLayer addAnimation:moveAnimation forKey:@"animation"];

Alert with text field

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- (void)changeName {
  // 修改昵称提示框
  UIAlertController *alertController =
      [UIAlertController alertControllerWithTitle:@"Title"
                                          message:nil
                                   preferredStyle:UIAlertControllerStyleAlert];
  // 添加输入框
  [alertController addTextFieldWithConfigurationHandler:^(UITextField *_Nonnull textField) {
    textField.placeholder = @"Please input";
  }];
  // 添加确定按钮
  [alertController addAction:[UIAlertAction actionWithTitle:@"Done"
                                                      style:UIAlertActionStyleDefault
                                                    handler:^(UIAlertAction *_Nonnull action) {
                                                      // 获得当前输入的字符串
                                                      NSString *name = alertController.textFields[0].text;
                                                      self.tichomeNameLbl.text = name;
                                                    }]];
  // 添加取消按钮
  [alertController addAction:[UIAlertAction actionWithTitle:@"Cancel"
                                                      style:UIAlertActionStyleCancel
                                                    handler:^(UIAlertAction *_Nonnull action){
                                                    }]];
  [self presentViewController:alertController animated:YES completion:nil];
}

UISlider

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-(void)setupSlider{
  self.volumeSlider = [UISlider new];
  [self.volumeSlider addTarget:self action:@selector(changeVolumeAction) forControlEvents:UIControlEventTouchUpInside];
  self.volumeSlider.minimumValueImage = [UIImage imageNamed:@"icVolumeDown"];
  self.volumeSlider.maximumValueImage = [UIImage imageNamed:@"icVolumeUp"];
  [self.volumeSlider setThumbImage:[UIImage imageNamed:@"icVolumeBtn"] forState:UIControlStateNormal];
  [self.volumeSlider setMinimumTrackImage:[UIImage imageNamed:@"minTrackBg"] forState:UIControlStateNormal];
  [self.volumeSlider setMaximumTrackImage:[UIImage imageNamed:@"maxTrackBg"] forState:UIControlStateNormal];
  [self.contentView addSubview:self.volumeSlider];
  [self.volumeSlider mas_makeConstraints:^(MASConstraintMaker *make) {
    make.centerX.equalTo(self.contentView.mas_centerX);
    make.bottom.equalTo(self.contentView.mas_bottom).offset(-kScaleFrom_iPhone6_Desgin(15));
    make.width.equalTo(@(kScaleFrom_iPhone6_Desgin(270)));
  }];
}

UITextView

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-(void)setupTextView{
  self.textView = [UITextView new];
  self.textView.backgroundColor = [UIColor clearColor];
  self.textView.text = @"placeholder";
  self.textView.textColor = [[UIColor whiteColor] colorWithAlphaComponent:0.2];
  self.textView.font = [UIFont systemFontOfSize:14];
  self.textView.delegate = self;
  self.textView.autocapitalizationType = UITextAutocapitalizationTypeNone;
  self.textView.returnKeyType = UIReturnKeyDone;
  [self.contentView addSubview:self.textView];
}

//  实现placeholder功能
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView {
  if (self.isEmpty) {
    textView.textColor = [UIColor whiteColor];
    textView.text = @"";
    self.isEmpty = NO;
  }
  return YES;
}

- (void)textViewDidEndEditing:(UITextView *)textView {
  if (textView.text.length == 0) {
    self.isEmpty = YES;
    textView.text = @"placeholder";
    textView.textColor = [[UIColor whiteColor] colorWithAlphaComponent:0.2];
  }
  [textView resignFirstResponder];
}

//  实现换行替换为结束编辑
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
  if ([text isEqualToString:@"\n"]) {
    [textView resignFirstResponder];
    return NO;
  }
  return YES;
}

IQActionSheetPickerView

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-(void)setupPickerView{
  NSArray *dataSource = @[@"item1",@"item2",@"item3"];
  IQActionSheetPickerView *categoryPicker = [[IQActionSheetPickerView alloc] initWithTitle:@"选择" delegate:self];
  //  tool bar
  [categoryPicker setTitleFont:[UIFont systemFontOfSize:17]];
  [categoryPicker setTitleColor:[UIColor whiteColor]];
  [categoryPicker setToolbarTintColor:[UIColorFromRGBA(0xff26272e) colorWithAlphaComponent:0.6]];
  [categoryPicker setDoneButtonAttributes:@{
    kIQActionSheetAttributesForNormalStateKey : @{
      NSForegroundColorAttributeName : [[UIColor whiteColor] colorWithAlphaComponent:0.5],
      NSFontAttributeName : [UIFont systemFontOfSize:15]
    }
  }];
  [categoryPicker setCancelButtonAttributes:@{
    kIQActionSheetAttributesForNormalStateKey : @{
      NSForegroundColorAttributeName : [[UIColor grayColor] colorWithAlphaComponent:0.5],
      NSFontAttributeName : [UIFont systemFontOfSize:15]
    }
  }];
  //  component
  [categoryPicker setPickerViewBackgroundColor:UIColorFromRGBA(0xff1c1d24)];
  [categoryPicker setPickerComponentsFont:[UIFont systemFontOfSize:16]];
  [categoryPicker setPickerComponentsColor:[UIColor whiteColor]];
  //  data source
  [categoryPicker setTitlesForComponents:@[ dataSource ]];
  if (self.category) {
    [categoryPicker setSelectedTitles:@[ @"item2" ]];
  }
  //  show
  [categoryPicker show];
}

- (void)actionSheetPickerView:(IQActionSheetPickerView *)pickerView didSelectTitles:(NSArray *)titles {
  //  do something with selected item
}

NSURLSession

completion handler 并非在主线程回调。
UI相关操作必须在主线程执行。

Protocol Buffers

Protocol buffers – a language-neutral, platform-neutral, extensible way of serializing structured data for use in communications protocols, data storage, and more.
Protocol buffers have many advantages over XML for serializing structured data. Protocol buffers:
are simpler
are 3 to 10 times smaller
are 20 to 100 times faster
are less ambiguous
generate data access classes that are easier to use programmatically

  1. protoc
  2. build rules
  3. build phases

Undefined symbols for architecture arm64

build phases -> compile source

NSError

error.localizedDescription

block

循环引用。

原始地址： http://sxgfxm.github.io/blog/2017/06/09/ioszhi-shi-xiao-ji-170529/
written by Light  posted at http://sxgfxm.github.io

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