Some simple introduction to iOS AutoLayout and how to use it

One. Use of AutoLayout:

Mainly used for screen adaptation, especially after the iphone6,plus has occurred.

Two. How to use AutoLayout?

Click on the left one to see:

Click on the left two:

Basically want to AutoLayout, will be in these two buttons on the fuss.

Then do an exercise, such as:

The width is 100, and then centered, regardless of how the view is reversed, always centered

One. There are two constraints: width, height, center:

1. . The width and height are all 100:

2. Centered (view with respect to the emulator)

3. OK, you'll find a little reminder on the top left. Such as

5. There is a yellow dot, indicating that you set the constraints are right, but you set the constraints of the object does not have the correct frame, but Xcode for us to do a little, click on the yellow dot, the default is update frame, click Fix, Yellow disappears, you are done,

   You may also find that there is a red dot, which may be a constraint is not enough, or a constraint conflict. Need to check constraints, generally, it is best to click below, the fastest check constraints.

Some simple introduction to iOS AutoLayout and how to use it