1. Autoresizing case
1. Before introducing autoresizing, tell everyone that this is just an introduction, do not use this thing in the future, use autolayout
Another very important thing is that if you use autoresizing, you cannot use autolayout, and vice versa
2. Let's look at a case, what kind of case is it, let's look at such a case,
Let's take a look at my requirements first:
1) Place four UIViews with a height and width of 100 at the four corners of the controller's view
2) Let these four UIViews always be displayed correctly at the four corners no matter what kind of screen they are on
We use autoresizing to achieve
Create a new project
Suppose, I open our controller
Main.storyboard
Check this, controller
Let's set it to 3.5 inches first
Simulator changed to iPhone4S
ok now is there a controller
Then, next, I want to be on the top of the controller, how to say, the northwest corner, the southwest corner, uh, the upper left corner, right?
Come, come, pay attention, did I put a View here?
Put a View up
The width and height of the View are both 100
Ok, then, I set the background color of this View, yellow
Then, is this View displayed in the upper left corner?
Ok, now this View is displayed in the upper left corner
Then, next, in the four corners, put four
Select it, hold down the option key, and drag
is there one in the upper right corner
Drag, there is one in the lower right corner,
drag
Is there one in the lower left corner?
In order to see clearly, each color is different
OK, now this screen's
Are there these four small squares on the four corners?
Come, at this time, we command + R, run it,
Everyone said, at this time, is there any problem?
Is this the way we set the frame before?
It's set up directly, it's set up directly, let's run it,
Under 3.5 inches, iPhone4S, see if the effect is correct or not,
have a look
At this time, doesn't it look very good
In the four corners of our top, bottom, left and right, it looks very good, that is to say, the case programs we were doing before, do they all have the same effect now, they look very good, but you have never tried those programs before us , hold down the command key + press the arrow key right
Is the screen turned to landscape?
Press and hold command + arrow key right, is the screen horizontal
After the screen is changed to landscape, is it still the same effect?
What we want is that after the screen is turned into a horizontal screen, a yellow square is displayed in the upper left corner, a blue square is displayed in the upper right corner, a purple square is displayed in the lower left corner, and a red square is displayed in the lower right corner.
What we want is that regardless of whether the screen is vertical or horizontal, it is required to display squares of different colors at the four corners.
Because, the frame we use now is written to death, without setting the screen adaptation,
So, below you, the red square, what is its constant Y value,
Is it 380, ah
When the screen becomes horizontal, the Y value is 380, does it go outside the screen?
Can't you see it?
In this case, is there no screen adaptation, just a 4-inch screen, after I horizontally screen, is the effect wrong?
Well, I'm going to replace it with another screen and see if it's right
