1) On the top of the controller, there are two UIViews, one is blue View and the other is red View
2) The heights of these two UIViews are always equal, and the heights of blue and red are equal, both of which are 50
3) Red View and blue View are right-aligned
4) The blue View is 30 from the left, top, and right sides of the parent control
5) Blue View, red View, the middle spacing is also fixed, 30
6) The left side of the red View, that is, the red View, is half of the blue View
The width of the red View is half of the blue View,
How to achieve this, you can set the two widths to be equal, and then change the width of the red View to half of the blue View, or you can set something, set the left side of the red View, and the midpoint of the controller, midline, aligned
This is not the midline, it is here
If the left side of the red View is aligned with the left side of our blue View, in this case, are they the same width?
However, if I set the left side of the red View to align with the center point of our current controller, then at this time, is the width of the red View exactly half of the blue View?
1) One is: set the red View to be as wide as the blue View, and then modify the "width" to be half of the blue View
2) One is: first set the red View to be horizontally centered, and then set the red View to the distance from our parent container, the center line of our View, so that the distance from the center line is equal to the distance to the left of the red View
Two ways of thinking, come on, write for everyone
2. The first way of thinking is to set the width of the red View and the blue View to be equal, and then modify the "width" to be half of the blue View
1. I will write in this project, and then drag a controller over
Pull such a controller
Well, after pulling it over, do you want to
Take the arrow above, bring it here
Move the arrow down, do you just execute this directly?
Then, next, we have two Views here, just drag the two Views
A blue View, a red View
We can pull one first, one by one
Pull a blue View over
background color, set to blue
blue
Then we set the constraints
OK, what is its width? There is no width, right?
It is 30 from left, right, up, and
When you set the distance from the left and the distance from the right, at this time, is its width and the width of X determined?
Then, its height, isn't it always 50
The height is also fixed
Then, give it a distance from the top, which is 30. In this case, its width and height, X and Y are all given, right?
It's all decided, so let's set up the blue View first
Blue View, we select this blue View
Write something, it's blue
OK, select the blue View
1) Then we set it, the distance
Distance, where, first uncheck this
distance up, left, right
Take a look at this drop down menu
distance, both are 30
Take a look at the drop down menu above
Take a look at this drop down menu on the right
distance, both are 30
2) Then, what is its height
is it 50
The height is 50
OK, point increase, after the increase is complete
There is no red arrow, click on the yellow arrow, it can completely suggest the position and size of the blue View
update it
Update, blue View, is it displayed here
2. Then, next, another red View
Drag it over, hold down the option key, and drag
At this time, delete all constraints on it and its control
Then, set its background color to red
Then
Next, look, what are the constraints
1) First, the requirement is that the distance between our red View and the blue View is also 30, ah
OK, then, I will select this red View, find its setting spacing, and set the distance on the top
Who is it?
How much is the distance from the blue View
is 30
Then, click to increase
Well, it is 30 away from the blue View
2) Then, set the right side of the red View to align with the right side of the blue View
Select the red View
Hold down the command key, and then select the blue View
re-select our blue
Then, check our alignment
What is the alignment, left alignment or right alignment
Align right, Trailing Edges: Align right, check it
Click to add
well, in this case
Red View, right-aligned, means it, it is right-aligned with this, is it aligned?
3) Then, you set its height, does it have to be the same as the height of the blue View?
So, one more
Select the red View
Then select the blue View
make both heights the same
Equal Heights
Then, are they the same height?
Click to add
After the height is the same, the distance between the red View and the blue View is 30, so is its Y value determined?
Then, the red View and the blue View are right-aligned. At this time, it is only right-aligned, so now its X and width have not been determined yet.
I just need to give it, so that the width of the red View and the width of the blue View are determined.
