IOS---transform (control position, size, rotation change)

Knowledge Points: Control Transform properties

There are three ways to change the shape of a control

1,cgaffinetransformmaketranslation (PAN)

2,cgaffinetransformmakescale (contraction)

3,cgaffinetransformmakerotate (swivel)

First, actual combat

Create the project first, and add a uiimageview to the project, with three buttons translated, shrunk, rotated,

Add an output source for Uiimageview, three keys to add an output event

Here's where the real code implementation begins.

Cgaffinetransformmaketranslation Demo

TX is the x-coordinate of the control offset

Ty is the y-coordinate of the control offset

This demo is implemented to move the control down

int tx=self. Imageshow. Transform. TX;

int ty=self. Imageshow. Transform. Ty+1;

self. Imageshow. Transform=cgaffinetransformmaketranslation(TX, ty);

Cgaffinetransformmakescale Demo

Global variables

Float sx=1.0,sy=1.0

Cgaffinetransformmakescale inside the parameter Sx,sy value range 0-1, is the control scaling size, I define the global variable is to change the size of the control is defined.

sx+=0.1;xy+=0.1;

self. Imageshow. Transform=cgaffinetransformmakescale(SX, Sy);

Cgaffinetransformmakerotate Demo

Define global variables float angle=0;

Angele value range-1---0---1 is the angle of the control rotation

angle+=0.1;

self. Imageshow. Transform=cgaffinetransformmakerotation(Angel);

IOS---transform (control position, size, rotation change)