iOSNSPredicate

Syntax

Predicate Format String Substitions
- C format string specifiers: %d, %s, %f, etc
- Object substitution: %@
- Keypath substitution: %K
Predicate Comparison Operators
- =, ==: Left-hand expression equals right-hand expression
- >=, =>: Left-hand expression is greater than or equal to right-hand expression
- <=, =<: Left-hand expression is less than or equal to right-hand expression
- >: Left-hand expression is greater than right-hand expression
- <: Left-hand expression is less than right-hand expression
- !=, <>: Left-hand expression is not equal to right-hand expression
- BETWEEN: Left-hand expression is between or equal to either of the values in the right-hand expression, which specifies lower and upper bounds - ex: BETWEEN { 0, 5 }
Predicate Compound Operators
- AND, &&: Logical AND
- OR, ||: Logical OR
- NOT, !: Logical NOT
Predicate String Comparison Operators
- BEGINSWITH: Left-hand expression begins with right-hand expression
- ENDSWITH: Left-hand expression ends with right-hand expression
- CONTAINS: Left-hand expression contains right-hand expression
- LIKE: Left-hand expression equals right-hand expression, with wildcard substitution
  - *: Match zero or more characters
  - ?: Match one character

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NSNotificationCenter

Creating an NSPredicate Using predicateWithBlock Next

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