UIAlertView function overloading

AlertView.h file

#import <Foundation/Foundation.h>

@interface AlertView : NSObject

+ (void)showAlert:(NSString*)message;

+ (void)showAlert:(NSString*)message WithDelegate:(id)delegate;

+ (void)showAlert:(NSString*)message WithDelegate:(id)delegate andTag:(int)tag;

+ (void)showAlert:(NSString*)message WithDelegate:(id)delegate andTag:(int)tag andButtons:(NSString *)buttons;

+ (void)showDiscardAlert:(NSString*)message WithDelegate:(id)delegate andTag:(int)tag andButtons:(NSString *)buttons;

@end

================================

AlertView.m file

#import "AlertView.h"

#define title @"PrognoCIS"

@implementation AlertView

+(void) showAlert: (NSString*)message

{

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title 

                    message:message delegate:nil  cancelButtonTitle:@"OK" otherButtonTitles: nil];

    [alert show];

}

+(void) showAlert: (NSString*)message WithDelegate:(id)delegate

{

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title   message:message

           delegate:delegate cancelButtonTitle:@"OK" otherButtonTitles: nil];

    [alert show];

}

+ (void)showAlert:(NSString*)message WithDelegate:(id)delegate andTag:(int)tag

{

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:message delegate:delegate

            cancelButtonTitle:@"OK" otherButtonTitles: nil];

    

    [alert setTag:tag];

    [alert show];

}

+ (void)showAlert:(NSString*)message WithDelegate:(id)delegate andTag:(int)tag andButtons:(NSString *)buttons

{

    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title message:message

            delegate:delegate cancelButtonTitle:@"Cancel" otherButtonTitles: buttons, nil];

    

    [alertView setTag:tag];

    [alertView show];

}

+ (void)showDiscardAlert:(NSString*)message WithDelegate:(id)delegate andTag:(int)tag andButtons:(NSString *)buttons

{

    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title 

    message:message delegate:delegate cancelButtonTitle:@"Discard" otherButtonTitles: buttons, nil];

    

    [alertView setTag:tag];

    [alertView show];

}

@end

================================

Usage in any file :

[AlertView showAlert:@"Discard the changes?" WithDelegate:self andTag:3000 andButtons:@"Discard"];

Adjust cell height dynamically in UITableView

#define GET_BOLD_FONT_WITH_SIZE(__SIZE) ([UIFont fontWithName:FONT_BOLD size:__SIZE])

//Method declaration

-(CGSize)calculateCellHeight:(NSString*)text;

//Usage

cellHeight=[self calculateCellHeight:info.textValue];

///////////////////////////////////////////////////

// Method : calculateCellHeight

// Params : text

// Description : To adjust cell height dynamicaly

//////////////////////////////////////////////////

-(CGSize)calculateCellHeight:(NSString*)text{

    

    CGSize height;

    height = [text sizeWithFont:GET_BOLD_FONT_WITH_SIZE(14)

              constrainedToSize:CGSizeMake(300.0, 1000.0)

                  lineBreakMode:UILineBreakModeWordWrap];

    return height;

}

Restrict user from selecting future date in UIDatePickerView

Below function disables the future date in UIDatePickerView 

-(void)setMaximumDateInDatePicker {       

    [dateTimePicker setMinuteInterval:1];   

    

    NSDate* now = [NSDate date] ;

    NSCalendar* calendar = [NSCalendar currentCalendar] ;

    NSDateComponents* nowWithoutSecondsComponents = [calendar components:(NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit|NSSecondCalendarUnit) fromDate:now] ;

    int currentHour=nowWithoutSecondsComponents.hour;

    int currentMinute=nowWithoutSecondsComponents.minute;

    int currentSecond=nowWithoutSecondsComponents.second;

  

    NSDate *maxDate = [[NSDate alloc] initWithTimeIntervalSinceNow:((24-currentHour)*60*60)-((currentMinute*60)+currentSecond+10)];

    dateTimePicker.maximumDate = maxDate ;

    NSLog(@"maxDate : %@ ",maxDate );

}

Toggle animation of view (up/down) on button click

In the below code snippet SearchBar toggles up and down with animation effect

[self animateView:DOWN];

////////////////////////////////////////////////////////

// Method : animateView

// Params : direction

// Return : animate the searchview appearance

////////////////////////////////////////////////////////

- (void)animateView:(NSString *)direction {

    

    [self.view bringSubviewToFront:patientSearchbar];

    

    if ([direction isEqualToString:DOWN]) {

        

        CGRect initialFrame = CGRectMake(0, 0 - searchView.frame.size.height  

        + 44, searchView.frame.size.width, searchView.frame.size.height);

        searchView.frame = initialFrame;

        

        searchView.layer.borderColor = VIOLET_BORDER_COLOR;

        searchView.layer.masksToBounds = NO;

        searchView.layer.shadowColor = [[UIColor blackColor] CGColor];

        searchView.layer.shadowOpacity = 1.0;

        searchView.layer.shadowRadius = 10.0;

        searchView.layer.shadowOffset = CGSizeMake(0, 3);

        

        [UIView animateWithDuration:0.5 delay:0.0 

        options:UIViewAnimationOptionCurveEaseOut animations:^{  

            

            CGRect viewRect =  CGRectMake(initialFrame.origin.x, 

        initialFrame.origin.y + initialFrame.size.height, 

        initialFrame.size.width, initialFrame.size.height);

           

            searchView.frame = viewRect;

            

        } completion:^(BOOL finished) {

             // Perform completion task here

        }];

        

    } else if ([direction isEqualToString:UP]){

        

        [UIView animateWithDuration:0.5 delay:0.0 

         options:UIViewAnimationOptionCurveEaseOut animations:^{  

       

              CGRect originalFrame = CGRectMake(0, 0 - 

         searchView.frame.size.height + 44, searchView.frame.size.width, 

         searchView.frame.size.height);

        

         searchView.frame = originalFrame;

            

        } completion:^(BOOL finished) {

            [searchView removeFromSuperview];

        }];

    }

}

Alternative method to check network connectivity using Reachability

Import Reachability file and create an object of Reachability

[self checkReachability];

-(void)checkReachability {

    

    [[NSNotificationCenter defaultCenter] addObserver:self

                selector:@selector(reachabilityChanged:)

                name:kReachabilityChangedNotification object:nil];

    

    reachability = [Reachability reachabilityWithHostName:@"www.google.com"];

    [reachability startNotifier];

}

- (void)reachabilityChanged:(NSNotification* )notification {

    

    Reachability* curReach = [notification object];

    if ([curReach currentReachabilityStatus] == NotReachable) {

        NSLog(@"Server not reachable....");

        [self hideOverlay];       

    }

    else {

        NSLog(@"Server reachable ....");

        

    }

}

Create custom navigation bar back button

//**************************************************************************

//Method    : createLeftNavigationButton

//Params    : create the left navigation back button with the image

//Return    :

//**************************************************************************

#define IMAGE(imageName)    (UIImage *)[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:imageName         ofType:IMAGE_TYPE_PNG]]

- (void)createLeftNavigationButton {

    

    //customize right bar button item

    UIView *backButtonView = [[UIView alloc] initWithFrame:NAVIGATION_BAR_BUTTON_RECT];

    [backButtonView setBackgroundColor:[UIColor clearColor]];

    

    UIButton *backButton = [[UIButton alloc] init];

    backButton.frame     = backButtonView.frame;

    [backButton addTarget:self action:@selector(backButtonClick:) 

         forControlEvents:UIControlEventTouchUpInside];

    [backButton setImage:IMAGE(@"backButton") forState:UIControlStateNormal];    

    [backButtonView addSubview:backButton];

    

    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]  

                                  initWithCustomView:backButtonView];    

}

Convert hexString to UIColor

//Usage

titleLabel.textColor = [UIColor colorFromHexString:@"#929292"];

//Method definition

- (UIColor *)colorFromHexString:(NSString *)hexString {

    NSString *cleanString = [hexString stringByReplacingOccurrencesOfString:@"#" withString:@""];

    if([cleanString length] == 3) {

        cleanString = [NSString stringWithFormat:@"%@%@%@%@%@%@", 

                       [cleanString substringWithRange:NSMakeRange(0, 1)],[cleanString substringWithRange:NSMakeRange(0, 1)],

                       [cleanString substringWithRange:NSMakeRange(1, 1)],[cleanString substringWithRange:NSMakeRange(1, 1)],

                       [cleanString substringWithRange:NSMakeRange(2, 1)],[cleanString substringWithRange:NSMakeRange(2, 1)]];

    }

    if([cleanString length] == 6) {

        cleanString = [cleanString stringByAppendingString:@"ff"];

    }

    unsigned int baseValue;

    [[NSScanner scannerWithString:cleanString] scanHexInt:&baseValue];

    float red = ((baseValue >> 24) & 0xFF)/255.0f;

    float green = ((baseValue >> 16) & 0xFF)/255.0f;

    float blue = ((baseValue >> 8) & 0xFF)/255.0f;

    float alpha = ((baseValue >> 0) & 0xFF)/255.0f;

    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];

}