IOS开发基础知识--碎片37

1：iOS 使用NJKWebViewProgress做webview进度条

引入头文件：
#import "NJKWebViewProgressView.h"
#import "NJKWebViewProgress.h"

遵守协议
<UIWebViewDelegate, NJKWebViewProgressDelegate>

实现代码
@implementation ViewController
{
    IBOutlet __weak UIWebView *_webView;
    NJKWebViewProgressView *_webViewProgressView;
    NJKWebViewProgress *_webViewProgress;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    _webViewProgress = [[NJKWebViewProgress alloc] init];
    _webView.delegate = _webViewProgress;
    _webViewProgress.webViewProxyDelegate = self;
    _webViewProgress.progressDelegate = self;

CGRect navBounds = self.navigationController.navigationBar.bounds;
CGRect barFrame = CGRectMake(,
                             navBounds.size.height - ,
                             navBounds.size.width,
                             );
_webViewProgressView = [[NJKWebViewProgressView alloc] initWithFrame:barFrame];
_webViewProgressView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
[_webViewProgressView setProgress: animated:YES];
[self loadBaidu];
[self.navigationController.navigationBar addSubview:_webViewProgressView];
}

-(void)loadBidu
{
    NSURLRequest *req = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.baidu.com/"]];
    [_webView loadRequest:req];
}

#pragma mark - NJKWebViewProgressDelegate
-(void)webViewProgress:(NJKWebViewProgress *)webViewProgress updateProgress:(float)progress
{
    [_webViewProgressView setProgress:progress animated:YES];
    self.title = [_webView stringByEvaluatingJavaScriptFromString:@"document.title"];
}

2：解决输入框UITextField关于拼音或部首被当作内容响应

// 添加监听
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(textFieldDidChanged:)
                                             name:UITextFieldTextDidChangeNotification
                                           object:self.textField];

// 监听处理
- (void)textFieldDidChanged:(NSNotification *)notification {
    NSString *text = self.textField.text;

    // 拼音输入时，拼音字母处于选中状态，此时不判断是否超长
    UITextRange *selectedRange = [self.textField markedTextRange];
    if (!selectedRange || !selectedRange.start) {
        if (text.length > MAXLENGTH) {
            self.textField.text = [text substringToIndex:MAXLENGTH];
        }
    }
}

这里主要使用了两个知识：

• 输入法输入时，拼音字母或者笔画处于选中状态，可以使用 markedTextRange 获取到
• 普通输入，以及将输入法的待选字填入输入框时，都会发出 UITextFieldTextDidChangeNotification， 可以监听这个通知，并事后对 UITextField 的内容做清理

另外除了使用监听 NSNotification 的方式，也可以使用 addTargetAction 的方式，代码如下：

[self.textField addTarget:self
                   action:@selector(textChange:)
         forControlEvents:UIControlEventEditingChanged];

这与上面的方式是等价的，但是使用 NSNotification 需要在对象销毁时 removeObserver，而这种方式不需要

3:根据内容自适应UIButton的大小

NSString *str = @"这是按钮的标题";
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.titleLabel.font = [UIFont systemFontOfSize:13.0];
//对按钮的外形做了设定，不喜可删~
    btn.layer.masksToBounds = YES;
    btn.layer.borderWidth = ;
    btn.layer.borderColor = [[UIColor blackColor] CGColor];
    btn.layer.cornerRadius = ;

    [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [btn setTitle:str forState:UIControlStateNormal];

//重要的是下面这部分哦！
    CGSize titleSize = [str sizeWithAttributes:@{NSFontAttributeName: [UIFont fontWithName:btn.titleLabel.font.fontName size:btn.titleLabel.font.pointSize]}];

    titleSize.height = ;
    titleSize.width += ;

    btn.frame = CGRectMake(, , titleSize.width, titleSize.height);
    [view addSubview:btn];

 4:解决部分文字样式不同的方法

    NSRange range =  [title rangeOfString:targetname];
    NSMutableAttributedString *mutableTitle = [[NSMutableAttributedString alloc] initWithString:title];
    [mutableTitle addAttribute:NSForegroundColorAttributeName value:COLOR_WORD_GRAY_2 range:NSMakeRange(, title.length)];

    if (range.length>) {
        [mutableTitle addAttribute:NSForegroundColorAttributeName value:HEXCOLOR(0xf7ab00) range:range];
        NSInteger startIndex = range.location+range.length;
        [mutableTitle addAttribute:NSForegroundColorAttributeName value:COLOR_WORD_GRAY_2 range:NSMakeRange(startIndex, title.length-startIndex)];
        [mutableTitle addAttribute:NSFontAttributeName value:CHINESE_SYSTEM() range:NSMakeRange(, title.length)];
    }

    self.titleLabel.attributedText=mutableTitle;

 5：Masonry scrollview循环布局

@interface ScrollViewController ()

@property (nonatomic, strong) UIScrollView *scrollView;

@end

@implementation ScrollViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  self.scrollView = [[UIScrollView alloc] init];
  self.scrollView.pagingEnabled = NO;
  [self.view addSubview:self.scrollView];
  self.scrollView.backgroundColor = [UIColor lightGrayColor];

  CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
  UILabel *lastLabel = nil;
  for (NSUInteger i = ; i < ; ++i) {
    UILabel *label = [[UILabel alloc] init];
    label.numberOfLines = ;
    label.layer.borderColor = [UIColor greenColor].CGColor;
    label.layer.borderWidth = 2.0;
    label.text = [self randomText];

    // We must preferredMaxLayoutWidth property for adapting to iOS6.0
    label.preferredMaxLayoutWidth = screenWidth - ;
    label.textAlignment = NSTextAlignmentLeft;
    label.textColor = [self randomColor];
    [self.scrollView addSubview:label];

    [label mas_makeConstraints:^(MASConstraintMaker *make) {
      make.left.mas_equalTo();
      make.right.mas_equalTo(self.view).offset(-);

      if (lastLabel) {
        make.top.mas_equalTo(lastLabel.mas_bottom).offset();
      } else {
        make.top.mas_equalTo(self.scrollView).offset();
      }
    }];

    lastLabel = label;
  }

  [self.scrollView mas_makeConstraints:^(MASConstraintMaker *make) {
    make.edges.mas_equalTo(self.view);

    // 让scrollview的contentSize随着内容的增多而变化
    make.bottom.mas_equalTo(lastLabel.mas_bottom).offset();
  }];
}

- (UIColor *)randomColor {
  CGFloat hue = ( arc4random() %  / 256.0 );  //  0.0 to 1.0
  CGFloat saturation = ( arc4random() %  / 256.0 ) + 0.5;  //  0.5 to 1.0, away from white
  CGFloat brightness = ( arc4random() %  / 256.0 ) + 0.5;  //  0.5 to 1.0, away from black
  return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:];
}

- (NSString *)randomText {
  CGFloat length = arc4random() %  + ;

  NSMutableString *str = [[NSMutableString alloc] init];
  for (NSUInteger i = ; i < length; ++i) {
    [str appendString:@"测试数据很长，"];
  }

  return str;
}

@end

6：Masonry remake更新约束

@interface RemakeContraintsController ()

@property (nonatomic, strong) UIButton *growingButton;
@property (nonatomic, assign) BOOL isExpanded;

@end

@implementation RemakeContraintsController

- (void)viewDidLoad {
  [super viewDidLoad];

  self.growingButton = [UIButton buttonWithType:UIButtonTypeSystem];
  [self.growingButton setTitle:@"点我展开" forState:UIControlStateNormal];
  self.growingButton.layer.borderColor = UIColor.greenColor.CGColor;
  self.growingButton.layer.borderWidth = ;
  self.growingButton.backgroundColor = [UIColor redColor];
  [self.growingButton addTarget:self action:@selector(onGrowButtonTaped:) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:self.growingButton];
  self.isExpanded = NO;
}

- (void)updateViewConstraints {
  // 这里使用update也是一样的。
  // remake会将之前的全部移除，然后重新添加
  [self.growingButton mas_remakeConstraints:^(MASConstraintMaker *make) {
    make.top.mas_equalTo();
    make.left.right.mas_equalTo();
    if (self.isExpanded) {
      make.bottom.mas_equalTo();
    } else {
      make.bottom.mas_equalTo(-);
    }
  }];

  [super updateViewConstraints];
}

- (void)onGrowButtonTaped:(UIButton *)sender {
  self.isExpanded = !self.isExpanded;
  if (!self.isExpanded) {
    [self.growingButton setTitle:@"点我展开" forState:UIControlStateNormal];
  } else {
    [self.growingButton setTitle:@"点我收起" forState:UIControlStateNormal];
  }

  // 告诉self.view约束需要更新
  [self.view setNeedsUpdateConstraints];
  // 调用此方法告诉self.view检测是否需要更新约束，若需要则更新，下面添加动画效果才起作用
  [self.view updateConstraintsIfNeeded];

  [UIView animateWithDuration:0.3 animations:^{
    [self.view layoutIfNeeded];
  }];
}

@end

 7:UIPickerView的运用

引入<UIPickerViewDataSource, UIPickerViewDelegate>

初始化：

self.pickArrayData=@[@"",@"",@"",@"",@"",@"",@"",@""];

if (!self.myPickView) {
            self.myPickView=[[UIPickerView alloc]init];
            self.myPickView.showsSelectionIndicator=YES;

            self.myPickView.dataSource = self;
            self.myPickView.delegate = self;
            [self addSubview:self.myPickView];
            [self.myPickView mas_makeConstraints:^(MASConstraintMaker *make) {
                make.left.mas_equalTo();
                make.right.mas_equalTo();
                make.top.mas_equalTo(self.topView.bottom).with.offset();
                make.height.mas_equalTo();
            }];

        }

#pragma mark UIPickerViewDataSource, UIPickerViewDelegate

// pickerView 列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return ;
}

// pickerView 每列个数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return self.pickArrayData.count;
}

// 每列宽度
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {

    return (SCREEN_WIDTH-)/;
}
// 返回选中的行
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSLog(@"%ld-%@",(long)component,[self.pickArrayData objectAtIndex:row]);
}

//返回当前行的内容,此处是将数组中数值添加到滚动的那个显示栏上
-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [self.pickArrayData objectAtIndex:row];
}

获取选中的内容：

-(void)confirmAction
{
    NSMutableString *result=[[NSMutableString alloc]init];;
    NSInteger row1=[self.myPickView selectedRowInComponent:];
    if (row1!=) {
        [result appendFormat:@"%@房",[self.pickArrayData objectAtIndex:row1]];
    }

    NSInteger row2=[self.myPickView selectedRowInComponent:];
    if (row2!=) {
        [result appendFormat:@"%@厅",[self.pickArrayData objectAtIndex:row2]];
    }

    NSInteger row3=[self.myPickView selectedRowInComponent:];
    if (row3!=) {
        [result appendFormat:@"%@卫",[self.pickArrayData objectAtIndex:row3]];
    }

    NSInteger row4=[self.myPickView selectedRowInComponent:];
    if (row4!=) {
        [result appendFormat:@"%@厨",[self.pickArrayData objectAtIndex:row4]];
    }

    NSInteger row5=[self.myPickView selectedRowInComponent:];
    if (row5!=) {
        [result appendFormat:@"%@阳台",[self.pickArrayData objectAtIndex:row5]];
    }

    self.selectedResult=[NSString stringWithString:result];

    if (self.confirmButtonBlock) {
        self.confirmButtonBlock(self.selectedResult);
    }
}

 8:汉字转为拼音

- (NSString *)Charactor:(NSString *)aString getFirstCharactor:(BOOL)isGetFirst
{
    //转成了可变字符串
    NSMutableString *str = [NSMutableString stringWithString:aString];
    //先转换为带声调的拼音
    CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformMandarinLatin,NO);
    //再转换为不带声调的拼音
    CFStringTransform((CFMutableStringRef)str,NULL, kCFStringTransformMandarinLatin,NO);
    CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
    NSString *pinYin = [str capitalizedString];
    //转化为大写拼音
    if(isGetFirst)
    {
        //获取并返回首字母
        return [pinYin substringToIndex:];
    }
    else
    {
        return pinYin;
    }
}