UIDevice+DEComposeViewController.m

//
//  UIDevice+DEComposeViewController.m
//  DEer
//
//  Copyright (c) 2011 Double Encore, Inc. All rights reserved.
//
//  Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
//  Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
//  Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer 
//  in the documentation and/or other materials provided with the distribution. Neither the name of the Double Encore Inc. nor the names of its 
//  contributors may be used to endorse or promote products derived from this software without specific prior written permission.
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
//  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 
//  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
//  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
//  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//

#import "UIDevice+DEComposeViewController.h"


@implementation UIDevice (DEComposeViewController)

+ (BOOL)de_isIOS5
{
    return (NSClassFromString(@"NSJSONSerialization") != nil);
}


+ (BOOL)de_isPad
{
    return [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad ? YES : NO;
}


+ (BOOL)de_isPhone
{
    return [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone ? YES : NO;
}


+ (BOOL)de_isRetinaDisplay
{
    UIScreen* screen = [UIScreen mainScreen];
    if ([screen respondsToSelector:@selector(displayLinkWithTarget:selector:)] &&
        [screen respondsToSelector:@selector(scale)]) {
        return screen.scale == 2.0f;
    }
    
    return NO;
}


@end