Programmer Think

Recently, when I was writing some little Demo review basics, when I used EditText, I suddenly found that I hardly noticed the color of its cursor and underline before, so I spent a lot of time and read many blogs. Now I will summarize and share the harvest. 1. First impression: native EditText We need to modify the native EditText, first o ...

UIBezierPath in UIKit is an encapsulation of the Core Graphics framework about path. Vector-based paths can be created, such as ellipses or rectangles, or shapes with multiple lines and curves. Basic Introduction and Use of Core Graphics Attributes: lineWidth: The line width attribute defines the curve specification drawn in the UIBezierPath ...

On the Types in C Types in C# are divided into value type and reference type. Reference type and value type are inherited from System.Object class. Almost all reference types are inherited directly from System.Object. Specifically, value type inherits a subclass of System.Object, that is, inherit System.ValueType. String type is a bit special, ...

1. Definition var plan = ["############################", "# # # o ##", "# #", "# ##### #", "## # # ## #", "### ## # #", "# ### # #", "# # ...

1: Simply put, the value stack is a lightweight data storage center corresponding to each request object, where data is managed uniformly for other parts of Struts 2 such as Action, Result, Interceptor and so on, so that data is managed centrally without clutter. Simply put, the value stack can provide a common data access service for each req ...

I. What is the producer-consumer model In real life, we may encounter the following situations: one module is responsible for generating data, the other module is responsible for processing data. Modules used to generate data become producers, and modules used to process data become consumers. Only producers and consumers are not enough. This ...

01 Thread Operation Sharing Data Security Issues * A: Thread Operation Sharing Data Security If there are multiple threads running at the same time, these threads may run the code at the same time. The result of each run of the program is the same as that of single thread, and the value of other variables is the same as expected, which is threa ...

User and Group ManagementEach user has a UID, the administrator root is 0, and the average user is 1-65535.System users: 1-499 (centos6), 1-999 (centos7)Login users: 500 + (centos6), 1000 + (centos7) / etc/passwd User and Its Attribute Information/ etc/group and its attribute information/ etc/shadow User Password and Related Properties/ et ...

Original address: http://www.jianshu.com/p/980ffdf3ed8c Preface In the process of using ReactiveCocoa, Josh Abernathy and Justin Spahr-Summers In order to enable RAC users to immerse themselves in the world of FRP and to program concurrently better, the two gods encapsulated the GCD and integrated it perfectly with the majo ...

abstract No matter how perfect a class design is, there may be some unpredictable situations in the future demand evolution. So how do you extend existing classes? Generally speaking, inheritance and combination are good choices. However, in Objective-C 2.0, category is also provided, which can dynamically add new behaviors to existing classes ...