Defaults persistence storage abstraction

Bohr/BOSetting.h

@@ -16,6 +16,9 @@
 /// The NSUserDefaults value assigned for the key defined on the cell.
 @property (nonatomic, assign) id value;
 
+/// Can be called as many times as desired but the new value will only be applied if the current value is nil
+- (void)setDefaultValue:(id)value;
+
 /// Instantiates a new BOSetting object with a key.
 + (instancetype)settingWithKey:(NSString *)key;
 

Bohr/BOSetting.m

@@ -40,6 +40,12 @@ - (void)setValue:(id)value {
 	}
 }
 
+- (void)setDefaultValue:(id)value {
+    if (!self.value) {
+        self.value = value;
+    }
+}
+
 - (void)setValueDidChangeBlock:(void (^)(void))valueDidChangeBlock {
 	_valueDidChangeBlock = valueDidChangeBlock;
 	if (valueDidChangeBlock) valueDidChangeBlock();

README.md

@@ -50,6 +50,14 @@ Here's an example of a really simple setup included in the demo project. Please
 }
 ```
 
+You can also set default values during boostrapping of your app :
+```obj-c
+[[BOSetting settingWithKey:@"fontfamily"] setDefaultValue:@"verdana"];
+    [[BOSetting settingWithKey:@"fontsize"] setDefaultValue:@(16)];
+```
+These values will only be applied if the current value of these settings are nil, so you can call these methods at every launch without prior-checks.
+
+
 #### Built-in BOTableViewCell's
 
 There's a bunch of built-in `BOTableViewCell` subclasses ready to be used: