Lan Yi Education September 28 record

// Start Touching

-(void) Touchesbegan: (nsset *) touches withevent: (uievent *) event{

//Nsset Collection arrays are similar in that they are used to mount multiple objects, But the difference is set unordered

// get arbitrary objects in set set

[Touches anyobject];

// turn set set to array

nsarray *arr = touches. allobjects;

uitouch *t = [touches anyobject];

cgpoint p = [t locationinview:self. View];

NSLog (@ "x=%f y=%f", p.x, p.y);

NSLog (@ "%@",nsstringfromcgpoint(p));

// convenient for all pictures

for (uiimageview *iv in self.) imageviews) {

// determine which picture is touching

if (cgrectcontainspoint(Iv. Frame, p)) {

// change the touch image into a property so that methods such as the move touch location method can call

Self. Dragview = IV;

break;

}

}

}

// Mobile Touch Location

-(void) touchesmoved: (nsset *) touches withevent: (uievent *) event{

uitouch *t = [touches anyobject];

cgpoint p = [t locationinview:self. View];

// let touch the center position of the picture equal to the location of the touch

Self. Dragview. Center = p;

}

// End Touch

-(void) touchesended: (nsset *) touches withevent: (uievent *) event{

uitouch *t = [touches anyobject];

cgpoint p = [t locationinview:self. View];

NSLog (@ "end%@",nsstringfromcgpoint(p));

// end Touch, unbind the touch's coordinates from the picture

Self. Dragview = nil;

}

// If a call comes in when an unexpected interruption occurs,

-(void) touchescancelled: (NSSt *) touches withevent: (uievent *) event{

uitouch *t = [touches anyobject];

cgpoint p = [t locationinview:self. View];

NSLog (@ "cancell%@",nsstringfromcgpoint(p));

}

the control from the original parent view Self . View move to a new parent view Self . Leftview , coordinate offset value correction method

// when the parent view changes, you need to convert the coordinates relative to the original parent view to the coordinates relative to the new parent view.

cgpoint oldcenter = self. Dragview. Center;

cgpoint newcenter = [self. View convertpoint: Oldcenter toview:self. Leftview];

[Self. Leftview addsubview:self. Dragview];

Self. Dragview. Center = newcenter;

Record the number of controls added to the view

By the number of items in the view sub-view array

Self. Rightlabel. text = [nsstring stringwithformat:@ '%d ',self. Rightview. subviews. Count];

leave the part of the view edge out of the display

Storyboard in the View properties selected Drawing in the Clip subsubviews tick

Lan Yi Education September 28 Records