【IOS开发基础系列】UITextField专题

作者: Kevin_Junbaozi | 来源:发表于2018-03-27 22:01 被阅读11次

【IOS开发基础系列】UITextField专题
iOS开发系列文章[转]
【IOS开发基础系列】地图开发专题
【IOS开发基础系列】Cocoa基础专题
【IOS开发基础系列】UIAlertController专题
【IOS开发基础系列】UIButton专题
【IOS开发基础系列】UICollectionView专题
【IOS开发基础系列】Storyboard专题
【IOS开发基础系列】UIViewController专题
【IOS开发基础系列】UIView专题

1 使用技巧

1.1 样式技巧

1.1.1 圆角边框

1. UITextField四周的圆角

textField.layer.cornerRadius = 5.0 需要导入框架QuartzCore.framework,并且在当前类中引用#import<QuartzCore/QuartzCore.h>

2. 光标过于靠前

有时候, 当点击输入框时, 你会发现光标就快挨着左边框了, 很不明显, 这是个很小的用户体验, 解决也很容易, 设置一下UITextField的边框样式。

textField.borderStyle = UITextBorderStyleRoundedRect;

这样就明显好看多了, 设置成这个样式后, 四周也会自带圆角, 并且有明显的凹凸效果。

1.1.2 边框颜色

self.layer.borderWidth = 1.0f; //边框宽度

self.layer.borderColor = [[UIColor colorWithRed:213.0/255 green:213.0/255 blue:213.0/255 alpha:1.0] CGColor]; //边框颜色

1.1.3 文字内容不贴边框显示

UIView *paddingView = [[UIView alloc] initWithFrame: CGRectMake(0, 0, 10, 20)];

textField.leftView = paddingView;

textField.leftViewMode = UITextFieldViewModeAlways;

1.1.4 文字长度自适应

TextKit学习通过boundingRectWithSize:options:attributes:context:计算文本尺寸

http://www.cnblogs.com/wjblogs/p/ios7-text.html

NSAttributedString *attrStr = [[NSAttributedString alloc] initWithString: textView.text];

textView.attributedText = attrStr;

NSRange range = NSMakeRange(0, attrStr.length);

// 获取该段attributedString的属性字典

NSDictionary *dic = [attrStr attributesAtIndex: 0 effectiveRange: &range];

// 计算文本的大小

CGSize textSize = [textView.text boundingRectWithSize: textView.bounds.size options: NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes: dic context: nil].size;// context上下文。包括一些信息，例如如何调整字间距以及缩放。该对象包含的信息将用于文本绘制。该参数可为nil

NSLog(@"w =%f", textSize.width);

NSLog(@"h = %f", textSize.height);

IOS7以下适配方法：

IOS字符串自动计算文本的宽和高

http://my.oschina.net/u/2285956/blog/355843

ios6, ios7上文字长度计算问题，可变长文字的自动适配显示

http://blog.csdn.net/smking/article/details/22221441

1.2 界面响应技巧

1.2.1 UItextField随键盘弹出而上移

（Good）为UITextField增加键盘偏移的模板化写法

http://www.cnblogs.com/ygm900/archive/2013/06/24/3152287.html

1.2.2 UIScrollView中处理UITextField被遮挡问题

//注册键盘监听消息

- (void) registerKeyBoardNotification

{

//增加监听，当键盘出现或改变时收出消息［核心代码］

[[NSNotificationCenter defaultCenter] addObserver: self selector:@selector(keyboardWillShow:) name: UIKeyboardWillShowNotification object: nil];

//增加监听，当键退出时收出消息

[[NSNotificationCenter defaultCenter] addObserver: self selector:@selector(keyboardWillHide:) name: UIKeyboardWillHideNotification object: nil];

}

//键盘显示

- (void) keyboardWillShow: (NSNotification*)aNotification

{

//键盘弹出后的frame

NSValue *keyboardBoundsValue = [[aNotification userInfo] objectForKey: UIKeyboardFrameEndUserInfoKey];

CGRectkeyboardBounds;

[keyboardBoundsValue getValue: &keyboardBounds];

//设置新的内边距，这个内边距是UIScrollView的最后一行距离UIScrollView底边框的距离，

//这样当该函数触发式，系统会将当前选中行距离窗口底边的距离设为该值，从而正好不被键盘遮盖住。

UIEdgeInsets e = UIEdgeInsetsMake(0, 0, keyboardBounds.size.height, 0);

[_loginScrollView setContentInset: e];

//调整滑动条距离窗口底边的距离

[_loginScrollView setScrollIndicatorInsets: e];

}

//键盘退出

- (void) keyboardWillHide: (NSNotification*)aNotification

{

//键盘缩回后，恢复正常设置

UIEdgeInsets e = UIEdgeInsetsMake(0, 0, 0, 0);

[_loginScrollView setScrollIndicatorInsets: e];

[_loginScrollView setContentInset: e];

}

1.2.3 全局退出软键盘

- (BOOL) textFieldShouldReturn: (UITextField*)textField

{

[self.view endEditing: YES];

return YES;

}

1.2.4 UITextField右侧小圆叉

_nickNameTextField.clearButtonMode = UITextFieldViewModeWhileEditing;

1.3 典型代码

_nickNameTextField = [[UITextField alloc] initWithFrame: CGRectMake(0, 64 + 30, self.view.frame.size.width, 50)];

// _nickNameTextField.placeholder = @"在此输入昵称";

NSString *namePlace = @"在此输入昵称";

NSMutableAttributedString *attNamePlace = [[NSMutableAttributedString alloc] initWithString: namePlace];

[attNamePlace addAttributes: [NSDictionary dictionaryWithObjectsAndKeys: [UIFont systemFontOfSize: 15], NSFontAttributeName, nil] range: NSMakeRange(0, namePlace.length)];

[_nickNameTextField setAttributedPlaceholder: attNamePlace];

_nickNameTextField.textColor = [UIColor blackColor];

_nickNameTextField.backgroundColor = [UIColor whiteColor];

_nickNameTextField.layer.borderWidth = 2.0;

_nickNameTextField.clearButtonMode = UITextFieldViewModeWhileEditing;

_nickNameTextField.layer.borderColor = (__bridge CGColorRef)([UIColor blackColor]);

_nickNameTextField.delegate = self;

UIView *paddingView = [[UIView alloc] initWithFrame: CGRectMake(0, 0, 20, 20)];

_nickNameTextField.leftView= paddingView;

_nickNameTextField.leftViewMode = UITextFieldViewModeAlways;

1.3.1 过滤emoj表情

+ (BOOL) isContainsEmoji: (NSString*)string

{

__block BOOL isEomji = NO;

[string enumerateSubstringsInRange: NSMakeRange(0, [string length]) options: NSStringEnumerationByComposedCharacterSequences usingBlock:

^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL*stop) {

const unichar hs = [substring characterAtIndex: 0];

if (0xd800 <= hs && hs <= 0xdbff) {

if (substring.length > 1) {

const unichar ls = [substring characterAtIndex: 1];

const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;

if (0x1d000 <= uc && uc <= 0x1f77f) {

isEomji =YES;

}

else if (substring.length > 1) {

const unichar ls = [substring characterAtIndex: 1];

if (ls == 0x20e3) {

isEomji =YES;

}

else{

if (0x2100 <= hs && hs <= 0x27ff && hs != 0x263b) {

isEomji =YES;

}

else if (0x2B05 <= hs && hs <= 0x2b07) {

isEomji =YES;

}

else if (0x2934 <= hs && hs <= 0x2935) {

isEomji =YES;

}

else if (0x3297 <= hs && hs <= 0x3299) {

isEomji =YES;

}

else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50|| hs == 0x231a) {

isEomji =YES;

}

}];

return isEomji;

}

/**

*过滤系统表情字符

*/

+ (NSString*) filterEmoji: (NSString*)string

{

NSUInteger len = [string lengthOfBytesUsingEncoding: NSUTF8StringEncoding];

const char *utf8 = [string UTF8String];

char *newUTF8 = malloc( sizeof(char) *len );

int j =0;

//0xF0(4) 0xE2(3) 0xE3(3) 0xC2(2) 0x30---0x39(4)

for ( int i =0; i< len; i++ ) {

unsigned intc =utf8;

BOOL isControlChar = NO;

if ( c == 4294967280 || c == 4294967089 || c == 4294967090 || c ==4294967091 || c ==4294967092 || c == 4294967093 || c == 4294967094 || c == 4294967095 || c == 4294967096 || c ==4294967097 || c == 4294967088) {

i = i +3;

isControlChar =YES;

}

if ( c == 4294967266 || c == 4294967267) {

i = i +2;

isControlChar =YES;

}

if ( c == 4294967234) {

i = i +1;

isControlChar =YES;

}

if(!isControlChar ) {