First step: Open the itunes software.
Step Two: Select the top left "file"--"import file into Repository".
The third step: Select the file you want to click Open.
Step Fourth: Select "Options" and then write the time you want to start and end, and note that the iphone ringtone only supports 40 seconds. Write the start time and stop time, and then click on the bottom right corner of the "good."
Step Fifth: Right click on the song again, choose "Create ACC Version", itunes will generate a song, under the original song.
Sixth: Right click on the "Most dazzling national wind" selection in the Finder, and then the suffix name "m4a" to "m4r". Because M4R is the format of the iphone ringtone. When you're done, remove the ringtone in itunes Note: Just delete the file in the itunes Music library instead of deleting it.
Step seventh: After completing the steps above, select "Ringtones" in itunes and drag and drop the file suffix "m4r" in the Finder to the ringtone library. After the iphone sync, the ringtone is visible in the phone's ringtone settings.
Step Eighth: The song part of the clip is automatically played in itunes and is automatically stored in the ringtone of the iphone device, and the "app" in the lower right corner will be used to sync the song to the iphone's bell-tone library. At this point, the custom bell-tone production is complete.