ios - Random Positioning issue -


i trying atm doing game. got problems randompositioning blocks. code, blocks keep spawning @ same lane fast. thats not mean to. should appear mario game. code:

humanmovement = [nstimer scheduledtimerwithtimeinterval:0.03 target:self selector:@selector(humanmoving) userinfo:nil repeats:yes];  [self placeblocks];  blockmovement = [nstimer scheduledtimerwithtimeinterval:0.03 target:self selector:@selector(blockmoving) userinfo:nil repeats:yes]; }  -(void)blockmoving{  startingblock.center = cgpointmake(startingblock.center.x -1, startingblock.center.y); block1.center = cgpointmake(block1.center.x -1, block1.center.y); block2.center = cgpointmake(block2.center.x -1, block2.center.y);  if ( block1.center.x > 20) {     [self placeblocks]; }  }  -(void)placeblocks{      randomblock1position = arc4random() %568;     randomblock1position = randomblock1position + 140;     randomblock2position = randomblock2position + 500;      block1.center = cgpointmake(193 , randomblock1position);     block2.center = cgpointmake(280 , randomblock2position);   }

so if understood correctly blocks should respawn once reach left side. in order have change center check position : 

if ( block1.center.x < 20) {     [self placeblocks]; }

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