Monday, 7 April 2014

How to convert JSON to NSString and NSString to JSON Data?

How to convert NSDictionary to NSString which contains JSON of NSDictionary or NSMutableArray ?

This trick is also usefull for insert the JSON of NSMutableArray or NSMutableDictionary to Sqlite Database.

Example :

Check this : http://stackoverflow.com/questions/14864088/how-to-convert-nsdictionary-to-nsstring-which-contains-json-of-nsdictionary

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:
                                             jsonObject
                                        options:0
                                        error:nil];
NSString *node_array_val = [[NSString alloc] initWithData:jsonData
                                             encoding:NSUTF8StringEncoding];
 
Now Add this string to Sqlite Databse Table. 

And How to get this string and convert to this string to 
NSMutableArray or NSMutabledictionary : 
 
Example : 

Check this  : http://stackoverflow.com/questions/18736250/converting-nsstring-to-nsdictionary-json 










NSString *jsonString = @"{\"ID\":{\"Content\":268,\"type\":\"text\"},
                          \"ContractTemplateID\":{\"Content\":65,\"type\":\"text\"}}";


 
NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
id json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];


Now if you do following NSLog statement



NSLog(@"%@",[json objectForKey:@"ID"]);



Result would be another NSDictionary.



{
    Content = 268;
    type = text;
}


 


 


 


 


 


 


 


 












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Thursday, 3 April 2014


          

        



















Visual Language Format Examples :  

I followed below this post : http://www.techotopia.com/index.php/Understanding_the_iOS_6_Auto_Layout_Visual_Format_Language

The visual format language is not a new programming language in the way that C++, Java
 and Objective-C are all programming languages. Instead, the visual 
format language defines a syntax through which auto layout constraints 
may be created using sequences of ASCII characters. These visual format 
character sequences are then turned into constraints by passing them 
through to the constraintsWithVisualFormat: method of the 
NSLayoutConstraint class.


What makes the language particularly appealing and intuitive is 
that the syntax used to define a constraint involves characters 
sequences that, to a large extent, visually represent the constraint 
that is being created. 



By far the easiest way to understand the concepts behind the visual 
format language is to look at some examples of the syntax. Take for 
example, visual format language syntax to describe a view object:





[mybutton]


 


 

As we can see, view objects are described in the visual format language by surrounding the view name with square brackets ([]). 


Two views may be constrained to be positioned flush with each 
other by placing the views side by side in the visual format string:





[mybutton1][mybutton2]


 



Similarly, a horizontal spacer between two view objects is represented by a hyphen:




 


[mybutton1]-[mybutton2]


 


 

The above example
 instructs the auto layout system to create a constraint using the 
standard spacing for views. The following construct, on the other hand, 
specifies a spacing distance of 30 points between the two views:




 


[mybutton1]-30-[mybutton2]


 


 


 

By default, constraints of the type outlined above are assumed to be 
horizontal constraints. Vertical constraints are declared using a V: 
prefix. For example, the following syntax establishes a vertical spacing
 constraint between two views:




 


V:[mylabel]-50-[mybutton]


 



For consistency and completeness, horizontal constraints may, optionally, be prefixed with H:.


The width of a view can be set specifically as follows:




 


[mybutton(100)]






Alternatively, inequality can be used:




 


[mybutton(<=100)]






Using similar syntax, the width of one view can be constrained to match that of a second view:




 


[mylabel(==mybutton2)]






When using the visual format language, the superview of the view for 
which the constraint is being described is represented by the | 
character. For example, the following visual format language construct declares
 a constraint for the mybutton1 view that attaches the leading and 
trailing edges of the view to the left and right edges of the containing
 superview with a spacing of 20 and 30 points respectively:




 


|-20-[mybutton1]-30-|






The language also allows priorities to be declared. The following 
excerpt specifies that the width of mybutton1 must be greater than, or 
equal to 70 points with a priority value of 500:




 


[mybutton1(>=70@500)]






Of particular importance, however, is the fact that the language may 
be used to construct multiple constraints in a single sequence, for 
example:




 


V:|-20-[mybutton1(>=70@500)]-[mybutton2(==mybutton1)]-30-[mybutton3]-|


 


 












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Monday, 24 March 2014


          

        









































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