常用控件知识

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/*********************** 1.UIButton***********************/

(1)水平左对齐

button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

距离左边10个像素:button.titleEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);

(2)全局变量的按钮需要判断，否则每次都会进行初始化

if(!startBtn) {

startBtn=[[UIButtonalloc]initWithFrame:CGRectMake(41,491,242,40)];

startBtn.backgroundColor=[UIColororangeColor];

[startBtnaddTarget:selfaction:@selector(startConnect)forControlEvents:UIControlEventTouchUpInside];

[startBtnsetTitle:@"开始连接"forState:UIControlStateNormal];

startBtn.layer.cornerRadius=20;

startBtn.layer.masksToBounds=YES;

[self.viewaddSubview:startBtn];

}

/*********************** 2.UILabel***********************/

(1)UILabel自适应宽高

(2)实现同一个控件中字体大小,颜色,位置不同

      /***********************
     兑换人数
     ***********************/
    _exchangeGiftPeopleNum.text=[NSStringstringWithFormat:@"%@人已兑换",@"168"];
    //截取人之前的字符串
    NSRange numRange=[_exchangeGiftPeopleNum.textrangeOfString:@"人"];
    NSMutableAttributedString*numStr=[[NSMutableAttributedStringalloc]initWithString:_exchangeGiftPeopleNum.text];

    [numStr addAttribute:NSForegroundColorAttributeNamevalue:[UIColorhexStringToColor:@"#fb606e"]range:NSMakeRange(0, numRange.location)];
    _exchangeGiftPeopleNum.attributedText=numStr;

    /***********************
     兑换条件
     ***********************/
    _exchangeGiftConditions.text=[NSStringstringWithFormat:@"需%@积分",@"500"];
    //把兑换条件变为可变的字符串
    NSMutableAttributedString*conditionStr=[[NSMutableAttributedStringalloc]initWithString:_exchangeGiftConditions.text];
    //截取积之前的字符串
    NSRange conditionRange=[_exchangeGiftConditions.textrangeOfString:@"积"];
    //从第1个字符到倒数第1个字符字体大小
    [conditionStr addAttribute:NSFontAttributeNamevalue:[UIFontfontWithName:@"HelveticaNeue-Bold"size:24.0]range:NSMakeRange(1,conditionRange.location-1)];

_exchangeGiftConditions.attributedText=conditionStr;

/*********************** 3.UIScrollowView***********************/

(1)Storyboard.xib 中使用scrollView的contentsize添加约束的开发总结

viewDidLoad里面添加了scrollView的contentsize设置没用，

scrollView的contentsize只能在viewDidAppear里面设置
http://www.tuicool.com/articles/7FbIZjN

/***********************  4.UITextField/UITextView***********************/
(1)实现左侧空出一定的边距
就是通过uitextfield的leftview来实现的，同时要设置leftviewmode。
如果设置左右边距，需要再加上rightView功能
-(void)setTextFieldLeftPadding:(UITextField *)textField forWidth:(CGFloat)leftWidth
{
    CGRect frame = textField.frame;
    frame.size.width = leftWidth;
    UIView *leftview = [[UIView alloc] initWithFrame:frame];
    textField.leftViewMode = UITextFieldViewModeAlways;
    textField.leftView = leftview;
}

(2)点击return 关闭键盘
-(BOOL)textFieldShouldReturn:(UITextField *)textField{
   
    [textField resignFirstResponder];
    return YES;
}

(3)实现UITextField值变化的实时监视
1、KVO方式
[textField addObserver:self forKeyPath:@"text" options:0 context:nil];
   2、直接添加监视[textField addTarget:self  action:@selector(valueChanged:)  forControlEvents:UIControlEventAllEditingEvents];

- (void)valueChanged:(UITextField*)textField
{
    NSLog(@"textFiled=%@",textField.text);
}

#pragma mark - 移除通知，否者返回主界面会崩溃
- (void)dealloc
{
    [_payMoneyField removeObserver:selfforKeyPath:@"text"];
}

(4)文本框处于不可编辑状态
你可以设置setUserInteractionEnabled=NO。

(5)UITextField/UITextView自定义关闭键盘
UIToolbar* topView = [[UIToolbaralloc]initWithFrame:CGRectMake(0,80,320,30)];
    [topView setBarStyle:UIBarStyleBlack];
//    UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil];
//    UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
  UIBarButtonItem* doneButton = [[UIBarButtonItemalloc]initWithTitle:@"退下键盘"style:UIBarButtonItemStyleDonetarget:selfaction:@selector(dismissKeyBoard)];
NSArray* buttonsArray = [NSArrayarrayWithObjects:doneButton,nil];
    [topView setItems:buttonsArray];
    [phoneFieldsetInputAccessoryView:topView];
    [bussAdresssetInputAccessoryView:topView];
    [bussPhonesetInputAccessoryView:topView];
- (void)dismissKeyBoard
{
    [phoneFieldresignFirstResponder];
    [bussPhoneresignFirstResponder];
    [bussAdressresignFirstResponder];
}

/***********************  4.NSString ***********************/
(1)如 把手机号码13713964459 变成 137****4459
    NSString*originTel =@"13713964459";
    NSString*tel = [originTel stringByReplacingCharactersInRange:NSMakeRange(3,4)withString:@"****"];
NSLog(@"tel:%@",tel);

(2)截取.之前的字符串
NSString *string=self.model.goodsImage;                 //1_04418207207476705.jpg
 NSRange range = [string rangeOfString:@"."];
NSString *str = [string substringToIndex:range.location];//1_04418207207476705

(3)截取NSString最后一位符号后的东东
    NSString* str =@"2011-01-18";
    NSString *temp1 = [[strcomponentsSeparatedByString:@"-"]lastObject];
    NSLog(@"temp1=%@",temp1);
    //temp1=18
    NSString *temp2 = [strsubstringFromIndex:[str length]-1];
    NSLog(@"temp2=%@",temp2);
    //temp2=8
(4)字符串查找子串并替换    NSString *d4 =@"2016/11";
    NSString *d5 = [d4stringByReplacingOccurrencesOfString:@"/"withString:@"年"];
    NSLog(@"d = %@", d5);
    //输出d = 2016年11


/***********************  5.延时 ***********************/
(1)延时3S：
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3*NSEC_PER_SEC)),dispatch_get_main_queue(), ^{
        NSLog(@"");
    });

/***********************  5.把编码形式转化成中文 ***********************/

Foundation+Log.m

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