iOS 平时常用的一些小方法

平时有一些常用的方法，我就写在这了，方便以后用

  ● //下划线  //调用 ： label.attributedText = [self underLine:string];

- (NSAttributedString *)underLine:(NSString *)str{
    NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:str];
    NSNumber *number = [NSNumber numberWithInteger:NSUnderlineStyleSingle];
    [string addAttribute:NSUnderlineStyleAttributeName value:number range:NSMakeRange(0, [string length])];
    return string;
}

• //删除线 //调用： label.attributedText = [self strikethroughLine:string];

- (NSAttributedString *)strikethroughLine:(NSString *)str{
    NSMutableAttributedString *string = [[NSMutableAttributedString alloc]initWithString:str];
    NSNumber *number = [NSNumber numberWithInteger:NSUnderlineStyleSingle];
    [string addAttribute:NSStrikethroughStyleAttributeName value:number range:NSMakeRange(0, [string length])];
    return string;
}

• //弹出定时提示框 //调用： [self showAlert:@"请先登录!"];

- (void)timerFireMethod:(NSTimer*)theTimer//弹出框
{
    UIAlertView *promptAlert = (UIAlertView*)[theTimer userInfo];
    [promptAlert dismissWithClickedButtonIndex:0 animated:NO];
    promptAlert = NULL;
}
- (void)showAlert:(NSString *) _message{//时间
    UIAlertView *promptAlert = [[UIAlertView alloc] initWithTitle:@"" message:_message delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
    
    [NSTimer scheduledTimerWithTimeInterval:1.0f
                                     target:self
                                   selector:@selector(timerFireMethod:)
                                   userInfo:promptAlert
                                    repeats:YES];
    [promptAlert show];
}

• //网络请求时转类型

//string转JSON
- (NSString *)jsonStringFromObject:(id)object {
    NSError *erro = nil;
    NSData *jsondata = [NSJSONSerialization dataWithJSONObject:object options:NSJSONWritingPrettyPrinted error:&erro];
    NSString *jsonString = [[NSString alloc]initWithData:jsondata encoding:NSUTF8StringEncoding];
    return jsonString;
}
//JSON转string
- (id)jsonStringToObject:(NSString *)jsonString
{
    NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSError *error;
    id object = [NSJSONSerialization JSONObjectWithData:data
                 
                                                options:NSJSONReadingAllowFragments
                 
                                                  error:&error];
    return object;
}

• //自定义返回按钮

- (void)setupBackItem {
    self.navigationItem.hidesBackButton = YES;
    [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];
    [self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];
    UIButton *back = [UIButton buttonWithType:UIButtonTypeCustom];
    back.frame = CGRectMake(15, 5, 30, 30);
    [back setBackgroundImage:[UIImage imageNamed:@"back"] forState:UIControlStateNormal];
    [back addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
//有时候系统的导航栏会抽，按钮靠死了视图变，就加上下面注释的代码
//UIBarButtonItem *btn_right = [[UIBarButtonItem alloc] initWithCustomView:btn];
   //UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]
                                       initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
                                       target:nil action:nil];

    //negativeSpacer.width = 10;
    //self.navigationItem.leftBarButtonItems = [NSArray arrayWithObjects:negativeSpacer, btn_right, nil];
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc]initWithCustomView:back];
    self.navigationItem.leftBarButtonItem = backItem;
    self.navigationController.navigationBar.barTintColor = MainColor;
}
- (void)back {
    [self.navigationController popViewControllerAnimated:YES];
}