UIDevice+DTFeatureCheck.h

//
//  UIDevice+DTFeatureCheck.h
//  DTUIKit
//
//  Created by Daniel Tull on 02.08.2010.
//  Copyright 2010 Daniel Tull. All rights reserved.
//

#import <Foundation/Foundation.h>


@interface UIDevice (DTFeatureCheck)
- (BOOL)dt_multitaskingSupported;
- (BOOL)dt_blocksSupported;
@end

UIDevice+DTFeatureCheck.m

//
//  UIDevice+DTFeatureCheck.m
//  DTUIKit
//
//  Created by Daniel Tull on 02.08.2010.
//  Copyright 2010 Daniel Tull. All rights reserved.
//

#import "UIDevice+DTFeatureCheck.h"
#import "UIDevice+DTSystemVersion.h"


@implementation UIDevice (DTFeatureCheck)

- (BOOL)dt_multitaskingSupported {
	
	if (![self respondsToSelector:@selector(isMultitaskingSupported)]) return NO;
	
	return self.multitaskingSupported;
}

- (BOOL)dt_blocksSupported {
	return ([self dt_majorSystemVersion] >= 4);
}

@end

UIDevice+DTSystemVersion.h

//
//  UIDevice+DTSystemVersion.h
//  DTUIKit
//
//  Created by Daniel Tull on 26.06.2009.
//  Copyright 2009 Daniel Tull. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIDevice (DTSystemVersion)
- (NSInteger)dt_majorSystemVersion;
- (NSInteger)dt_minorSystemVersion;
- (NSInteger)dt_maintenanceSystemVersion;
@end

UIDevice+DTSystemVersion.m

//
//  UIDevice+DTSystemVersion.m
//  DTUIKit
//
//  Created by Daniel Tull on 26.06.2009.
//  Copyright 2009 Daniel Tull. All rights reserved.
//

#import "UIDevice+DTSystemVersion.h"

@interface UIDevice ()
- (NSInteger)dtInternal_systemVersionComponentAtIndex:(NSInteger)index;
@end

@implementation UIDevice (DTSystemVersion)

- (NSInteger)dtInternal_systemVersionComponentAtIndex:(NSInteger)index {
	
	NSArray *components = [self.systemVersion componentsSeparatedByString:@"."];
	
	if ([components count] <= index) return -1;
	
	return [[components objectAtIndex:index] integerValue];
}

- (NSInteger)dt_majorSystemVersion {
	return [self dtInternal_systemVersionComponentAtIndex:0];
}

- (NSInteger)dt_minorSystemVersion {
	return [self dtInternal_systemVersionComponentAtIndex:1];
}

- (NSInteger)dt_maintenanceSystemVersion {
	return [self dtInternal_systemVersionComponentAtIndex:2];
}

@end