iOS获取通话状态

1.首先引入CoreTelephony.framework
2.加入头文件

1	#import <CoreTelephony/CTCallCenter.h>

3.功能实现

1234	CTCallCenter *center = [[CTCallCenter alloc] init];center.callEventHandler = ^(CTCall *call){        NSLog(@"Call State : %@",[call description]);    };

当电话打进来时，程序就会执行我们的block.
CTCall (0x1ab590) {
callState: [CTCallStateIncoming]
Call ID: [2B9E84A9-0F12-4539-AC8D-AF2A7ED7069E]
}
CTCall (0x183a00) {
callState: [CTCallStateDisconnected]
Call ID: [2B9E84A9-0F12-4539-AC8D-AF2A7ED7069E]
}
注:__OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_4_0)