UITextField category that adds a shake animation like the password field of the OsX login screen.

##Screenshot

##Setup with Cocoapods

pod 'UITextField+Shake', '~> 1.1'

Import UITextField+Shake.h in your controller's header file, or UITextField_Shake if you are using the use_frameworks! directive.

##Setup with Carthage

github "andreamazz/UITextField-Shake"

##Usage

###In Objective-C

// Shake
[[self.textField] shake];

// Shake with the default speed
[self.textField shake:10   // 10 times
            withDelta:5    // 5 points wide
];

// Shake with a custom speed
[self.textField shake:10   // 10 times
            withDelta:5    // 5 points wide
                speed:0.03 // 30ms per shake
];

// Shake with a custom speed and direction
[self.textField shake:10   // 10 times
            withDelta:5    // 5 points wide
                speed:0.03 // 30ms per shake
       shakeDirection:ShakeDirectionVertical
];

###In Swift

// Shake
self.textField.shake()
        
// Shake with the default speed
self.textField.shake(10,              // 10 times
                     withDelta: 5.0   // 5 points wide
)
        
// Shake with a custom speed
self.textField.shake(10,              // 10 times
                     withDelta: 5.0,  // 5 points wide
                     speed: 0.03      // 30ms per shake
)
        
// Shake with a custom speed and direction
self.textField.shake(10,              // 10 times
                     withDelta: 5.0,  // 5 points wide
                     speed: 0.03,     // 30ms per shake
                     shakeDirection: ShakeDirection.Vertical
)

##Completion Handler You can also pass a completion block that will be performed as soon as the shake animation stops

- (void)shake:(int)times withDelta:(CGFloat)delta completion:(void((^)()))handler;
- (void)shake:(int)times withDelta:(CGFloat)delta speed:(NSTimeInterval)interval completion:(void((^)()))handler;
- (void)shake:(int)times withDelta:(CGFloat)delta speed:(NSTimeInterval)interval shakeDirection:(ShakeDirection)shakeDirection completion:(void((^)()))handler;

or in Swift using the trailing closure syntax:

textField.shake(10, withDelta: 5) {
    println("done")
}

#Author Andrea Mazzini

#MIT License Copyright (c) 2015 Andrea Mazzini. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.