直接代码：
类
// ACETelPrompt.h
#import <Foundation/Foundation.h>
@interface ACETelPrompt :
NSObject
typedef
void (^ACETelCallBlock)(NSTimeInterval duration);
typedef
void (^ACETelCancelBlock)(void);
+ (BOOL)callPhoneNumber:(NSString *)phoneNumber
call:(ACETelCallBlock)callBlock
cancel:(ACETelCancelBlock)cancelBlock;
@end
// ACETelPrompt.m
#import "ACETelPrompt.h"
#import "AppDelegate.h"
// the time required to launch the phone app and come back (will be substracted to the duration)
#define kCallSetupTime 3.0
@interface
ACETelPrompt ()
@property (nonatomic,
strong) NSDate *callStartTime;
@property (nonatomic,
copy) ACETelCallBlock callBlock;
@property (nonatomic,
copy) ACETelCancelBlock cancelBlock;
@end
@implementation ACETelPrompt
+ (instancetype)sharedInstance
{
static ACETelPrompt *_instance =
nil;
static dispatch_once_t oncePredicate;
dispatch_once(&oncePredicate, ^{
_instance = [[self
alloc] init];
});
return _instance;
}
+ (BOOL)callPhoneNumber:(NSString *)phoneNumber
call:(ACETelCallBlock)callBlock
cancel:(ACETelCancelBlock)cancelBlock
{
if ([self
validPhone:phoneNumber]) {
ACETelPrompt *telPrompt = [ACETelPrompt
sharedInstance];
// observe the app notifications
[telPrompt
setNotifications];
// set the blocks
telPrompt.callBlock = callBlock;
telPrompt.cancelBlock = cancelBlock;
// clean the phone number
NSString *simplePhoneNumber =
[[phoneNumber componentsSeparatedByCharactersInSet:
[[NSCharacterSet
decimalDigitCharacterSet] invertedSet]]
componentsJoinedByString:@""];
// call the phone number using the telprompt scheme
NSString *stringURL = [@"telprompt://"
stringByAppendingString:simplePhoneNumber];
[[UIApplication
sharedApplication] openURL:[NSURL
URLWithString:stringURL]];
return YES;
}
return
NO;
}
+ (BOOL)validPhone:(NSString*) phoneString
{
NSTextCheckingType type = [[NSTextCheckingResult
phoneNumberCheckingResultWithRange:NSMakeRange(0, phoneString.length)
phoneNumber:phoneString]
resultType];
return type ==
NSTextCheckingTypePhoneNumber;
}
#pragma mark - Notifications
- (void)setNotifications
{
[[NSNotificationCenter
defaultCenter] addObserver:self
selector:@selector(applicationDidEnterBackground:)
name:UIApplicationDidEnterBackgroundNotification
object:nil];
[[NSNotificationCenter
defaultCenter] addObserver:self
selector:@selector(applicationDidBecomeActive:)
name:UIApplicationDidBecomeActiveNotification
object:nil];
}
#pragma mark - Events
- (void)applicationDidEnterBackground:(NSNotification *)notification
{
// save the time of the call
self.callStartTime = [NSDate
date];
}
- (void)applicationDidBecomeActive:(NSNotification *)notification
{
// now it‘s time to remove the observers
[[NSNotificationCenter
defaultCenter] removeObserver:self];
if (self.callStartTime !=
nil) {
// I‘m coming back after a call
if (self.callBlock !=
nil) {
self.callBlock(-([self.callStartTime
timeIntervalSinceNow]) -
kCallSetupTime);
}
// reset the start timer
self.callStartTime =
nil;
}
else if (self.cancelBlock !=
nil) {
// user didn‘t start the call
self.cancelBlock();
}
}
调用
- (IBAction)connectUs:(id)sender {
[ACETelPrompt
callPhoneNumber:@"020-38880808080"
call:^(NSTimeInterval duration) {
NSLog(@"User made a call of %.1f seconds", duration);
}
cancel:^{
NSLog(@"User cancelled the call");
}];
}
@end