Calling uiimagepickerviewcontroller on iPad is slightly different from calling iphoen.

We know that the following methods are commonly used to obtain the photo library from the iPhone:

Uiimagepickercontroller * m_imagepicker = [[uiimagepickercontroller alloc] init];
If ([uiimagepickercontroller issourcetypeavailable:
Uiimagepickercontrollersourcetypephotolibrary]) {
M_imagepicker.sourcetype = uiimagepickercontrollersourcetypephotolibrary;
M_imagepicker.delegate = self;
// [M_imagepicker.navigationbar.subviews];
[M_imagepicker setallowsediting: No];
// M_imagepicker.allowsimageediting = no;
[Self presentmodalviewcontroller: m_imagepicker animated: Yes];
[M_imagepicker release];
} Else {
Uialertview * Alert = [[uialertview alloc] initwithtitle: Nil message: @ "Error accessing photo library! "Delegate: Nil cancelbuttontitle: @" close "otherbuttontitles: Nil];
[Alert show];
[Alert release];
}

This is no problem with iPhone operations. However, when we encounter problems in the iPad environment, the following error will be reported during running:

Terminating app due to uncaught exception 'nsinvalidargumentexception ', reason: 'On iPad, uiimagepickercontroller must be presented via uipopovercontroller'

Therefore, we must use uipopovercontroller. The specific implementation is as follows:

Uiimagepickercontroller * m_imagepicker = [[uiimagepickercontroller alloc] init];
If ([uiimagepickercontroller issourcetypeavailable:
Uiimagepickercontrollersourcetypephotolibrary]) {
M_imagepicker.sourcetype = uiimagepickercontrollersourcetypephotolibrary;
M_imagepicker.delegate = self;
[M_imagepicker setallowsediting: No];
Uipopovercontroller * popover = [[uipopovercontroller alloc] initwithcontentviewcontroller: m_imagepicker];
Self. popovercontroller = popover;
// Popovercontroller. Delegate = self;


[Popovercontroller presentpoverfromrect: cgrectmake (0, 0,300,300) inview: Self. View permittedarrowdirections ctions: uipopoverarrowdirectionany animated: Yes];


// [Self presentmodalviewcontroller: m_imagepicker animated: Yes];
[Popover release];
[M_imagepicker release];
} Else {
Uialertview * Alert = [[uialertview alloc] initwithtitle: Nil message: @ "Error accessing photo library! "Delegate: Nil cancelbuttontitle: @" close "otherbuttontitles: Nil];
[Alert show];
[Alert release];
}
Note that a global uipopovercontroller object popovercontroller is assigned to the partial uipopovercontroller object popopovercontroller. Instead, you cannot directly call pover. Because popover objects cannot be released when they are still visible.

 

This article Reprinted from: http://blog.csdn.net/fxj281314