ios - Collision detection not working on all sides of UIImageView -

This code is used for my collision testing, but it only works on 2 sides on each UIImageView. Why does not it work for three parties? This will not work towards the UIImageView or the left and right top and bottom. Why is it just top and left, top and right or lower and right or lower and left? How do I work on at least 3 sides?

  int moveX; Let's go; ViewController.h {IBOutlet UIImageView * Circle; NSTimer * time; IBOutlet UIImageView * forum; } - (IBAction) StartGame: (ID) sender; - (zero) moveCircle; - (zero) bounce; @ Endcontroller.m - (IBAction) StartGame: (ID) sender {start.hidden = YES; Time = [NSTimer Scheduled Timer With Time Interface: 0.02 Goal: Self Selector: @Selector (Moving Chakra) User Information: Zero Repeats: Yes]; CircleX = arc4random ()% 11; CircleX = circleX-5; CircleY = arc4random ()% 11; CircleY = circle Y-5; CircleX = arc4random ()% 11; CircleX = circleX + 5; CircleY = arc4random () 11% ;; CircleY = circle Y + 5; If (circle X == 0) {circleX = 1; } If (circle y == 0) {circleY = 1; } - (empty) step circle circle {circle.center = CGPointMake (circle.center.x -circleX, circle.center.y-cycleY); If (Circle Center X <30) {circleX = 0-circleX; } If (circle center.x> 320) {circleX = 0-circleX; } If (Circle Center 28. 28) {circleY = 0-circleY; } If (circle center and 568) {circleY = 0-circleY; } [Self-surge]; } - (zero) bounce {if (cgttexterctactcreate (circle.frame, platform.frame)) {circleY = arc4random ()% 5; CircleY = 0 + circleY; CircleX = arc4random ()% 5; CircleX = 0 + circleX; CircleY = arc4random ()% 5; CircleY = 0-circleY; CircleX = arc4random ()% 5; CircleX = 0-circleX; }}   
 
 
 I have no meaning in your question, but see your code:  
 Believing that you start with  StartGame , hopefully only happens once: 
 
 
 You create a timer ( When this game ends, it should be held invalid 
 
 You set  circleX  and  circleY  between 5 and 5 in some random condition 
 
 Do you set 5 and 15 (again?!) 
 
 between some random  circleX  and  circleY  for the status check that  circleX  and <
 
 
 then move the circle : 
 
 
 You add the circle center to the  circleX  and the  circleY  values, then accept those two values, actually the speed is (Well enough) 
 
 You check the condition of the circle out of bounds and reject at the right pace << / Li> 
 You    >   
 call for more bounce method  
 
 You check that  circle  and  forums      > CircleY  and  circleY  to 0 to 4 
 
 You set a random set  circleX  and  circleY  speed from 0 to -4 (then?!) 
 
 
 So what can I say with this code you have 2 views on your view controller, where a  Is a static barrier, and the second moves  circle . The circle itself will proceed in some direction based on some random values ​​from its own  Stargam  method and tightened harsh borders right away. If the intersection with the  board   platform , the speed in some random negative values ​​between 4 and 0 will change in both cycle X-Y. 
 
 What is this issue really? By jumping  platform  will increase the  circle  towards the top-left corner of the screen, regardless of any side  circle  to the  platform  From the  bounce  method to find the right value for the new speed based on which direction you get from  platform , some  if  Details should be