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IOS uses xib to define a View and modify the frame to solve the invalid problem. iosxib I have encountered a lot of problems with using custom views and modifying the frame is invalid. Before that, I gave up xib and handwritten it directly. I found

: This article mainly introduces the difference between const and define in php (supplement). If you are interested in PHP tutorials, refer to it. A constant is the identifier (name) of a simple value ). As its name implies, this value cannot be

First, the constPHP5.3 Previously, const can only declare variables inside a class, 5.3+ allows variables to be declared externally, but cannot be evaluated with constants!Const one = 1; Const WORD = ' Hello World ';PHP5.6 Start, const supports

The difference between define () and const in php is described in detail. In php, both define () and const () can define constants. So what is the difference between define () and const? many programmers do not understand this, next I will introduce

A constant is an identifier (first name) of a simple value. As the name implies, the value cannot be changed during script execution (except for the so-called magic constants, they are not constants). Changshime is considered to be case sensitive.

In php, both define () and const () can define constants. So what is the difference between define () and const? many programmers do not understand this, I will introduce you In php, both define () and const () can define constants. So what is the

A constant is an identifier (first name) of a simple value. As the name implies, the value cannot be changed during script execution (except for the so-called magic constants, they are not constants). Changshime is considered to be case sensitive.

1) # define is a pre-processing command. It is a simple replacement during compilation and pre-processing, and does not check the correctness. It does not mean that it is correct or not, possible errors are detected and reported only when the

  Difference between typedef and # define  The benefits of renaming constants using macro definitions: The program is easy to implement and easy to maintain and modify; 1) # define is a pre-processing command that performs simple replacement during

In PHP define () and const () can define constants, then the difference between define () and const exactly where, this many programmers do not understand, I would like to introduce to you some of this function usage ratio. The difference between