IOS simple code snap

 

# Define Switch_tag 102

-(Void) Updateswitch :(ID) Sender
{
//Toggle the switch from its current setting
Uiswitch * s = [self. View. Window switchwithtag: switch_tag];
[S Seton :! S. ISON];
}

 

-(Void) Updatetime :(ID) Sender

{
// Set the label to the current time
[Self. View. Window labelwithtag: label_tag]. Text = [[nsdate date] description];
}

 

 

// This is a private version of the function that appears in my uiview frame category
// It's got ded here as a private function to avoid requiring the other file
Cgrect rectwithcenter (cgrect rect, cgpoint Center)
{
Cgrect newrect = cgrectzero;
Newrect. Origin. x = center. X-cgrectgetmidx (rect );
Newrect. Origin. Y = center. Y-cgrectgetmidy (rect );
Newrect. size = rect. size;
Return Newrect;

}

 

Xcode debug instruction: Print Po BT

Change to gdb debugger: product "->" manage schemes "-> Info-> debugger-> select GDB

Relevant information

Http://blog.163.com/agw_slsyn/blog/static/30915112201213112813356/

Http://www.cnblogs.com/lovecode/articles/2343818.html

 

 

-( Void ) Move: (nstmer *) atimer
{
// Rotate each iteration by 1% of Pi
Cgfloat angle = Theta * (m_pi/ 100366f );
Cgaffinetransform transform = cgaffinetransformmakerotation (angle );

// Theta ranges between 0% and 199% of Pi, I. e. between 0 and 2 * pi
Theta = (theta + 1 ) % 200 ;

// For fun, scale by the absolute value of the cosine
Float Degree = cos (angle );
If (Degree < 0.0 ) Degree * =- 1.0f ;
Degree + = 0.5f ;

// Create add scaling to the rotation transform
Cgaffinetransform scaled = cgaffinetransformscale (transform, degree, degree );

// Apply the affine transform
[[Self. View viewwithtag: 999 ] Settransform: scaled];

}

 

 

-(Void) Fadeout :(ID) Sender

{
Cgcontextref context = uigraphicsgetcurrentcontext ();
[Uiview beginanimations: Nil context: Context];
[Uiview setanimationcurve: uiviewanimationcurveeaseinout];
[Uiview setanimationduration: 1.0 ];
[[Self. View viewwithtag: 999 ] Setalpha: 0.0f ];
[Uiview commitanimations];
Self. navigationitem. rightbarbuttonitem = barbutton ( @" Fade in " , @ Selector (fadein :));
}

-(Void) Fadein :(ID) Sender
{
Cgcontextref context = uigraphicsgetcurrentcontext ();
[Uiview beginanimations: Nil context: Context];
[Uiview setanimationcurve: uiviewanimationcurveeaseinout];
[Uiview setanimationduration:1.0];
[[Self. View viewwithtag:999] Setalpha:1.0f];
[Uiview commitanimations];
Self. navigationitem. rightbarbuttonitem = barbutton (@"Fade out", @ Selector (fadeout :));
}

 

 

-(Void) Swap :(ID) Sender

{
// Hide the button
Self. navigationitem. rightbarbuttonitem = nil;

Uiview * frontobject = [[self. View subviews] objectatindex: 2 ];
Uiview * backobject = [[self. View subviews] objectatindex: 1 ];

Cgcontextref context = uigraphicsgetcurrentcontext ();
[Uiview beginanimations: Nil context: Context];
[Uiview setanimationcurve: uiviewanimationcurveeaseinout];
[Uiview setanimationduration: 1.0 ];

Frontobject. Alpha = 0.0f ;
Backobject. Alpha = 1.0f ;
Frontobject. Transform = cgaffinetransformmakescale ( 0.25f , 0.25f );
Backobject. Transform = cgaffinetransformidentity;
[Self. View exchangesubviewatindex: 1 Withsubviewatindex: 2 ];

[Uiview setanimationdelegate: Self];
[Uiview setanimationdidstopselector: @ selector (animationfinished :)];
[Uiview commitanimations];

}

 

 

 

-(Void) Flip :(ID) Sender

{
// Hide the button
Self. navigationitem. rightbarbuttonitem = nil;

Cgcontextref context = uigraphicsgetcurrentcontext ();
[Uiview beginanimations: Nil context: Context];
[Uiview setanimationcurve: uiviewanimationcurveeaseinout];
[Uiview setanimationduration: 1.0 ];

Uiview * whitebackdrop = [self. View viewwithtag: 100 ];

// choose left or right flip
If ([(uisegmentedcontrol *) self. navigationitem. titleview selectedsegmentindex])
[uiview setanimationtransition: uiviewanimationtransitionflipfromleft forview: whitebackdrop cache: Yes];
else
[uiview setanimationtransition: uiviewanimationtransitionflipfromright forview: whitebackdrop cache: Yes];

Nsinteger Purple = [[whitebackdrop subviews] indexofobject: [whitebackdrop viewwithtag:999];
Nsinteger maroon = [[whitebackdrop subviews] indexofobject: [whitebackdrop viewwithtag:998];
[Whitebackdrop exchangesubviewatindex: Purple withsubviewatindex: maroon];

[Uiview setanimationdelegate: Self];
[Uiview setanimationdidstopselector: @ selector (animationfinished :)];
[Uiview commitanimations];
}