iOS Development--use toolbar to adjust the interval between item

Toolbar's item has a lot of styles, in fact, it is often used in several ways,

Uibarbuttonsystemitemfixedspace stick: Can be understood as a fixed length

Uibarbuttonsystemitemflexiblespace Spring: Can be understood as the length of elasticity

Uibarbuttonitem has two Barbutton formats added to ToolbarItems = @[sticks, buttons, springs, buttons, sticks]; sticks are fixed lengths. Spring is flexible. You can try it!

Then give the stick a fixed width, you can have the desired effect, do not appear to be too far off, such as:

Before adjustment:

Adjustment

After adjustment:

According to

According to this logic, the center, left, on the right can be achieved!

iOS Development--use toolbar to adjust the interval between item