1.一行代码收起键盘
tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
2.取消tableview的分割线
TableView.separatorStyle = UITableViewCellAccessoryNone
3.取消头部视图跟随效果
//切换tableview的style UITableViewStyleGrouped头部视图不跟随
self.mainTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, kWidth, kHeight - 50) style:UITableViewStyleGrouped]
4.解决tableview视图上移
方案一
self.automaticallyAdjustsScrollViewInsets = NO;// 默认是YES
方案二
self.edgesForExtendedLayout = UIRectEdgeNone;// 推荐使用
5.html字符串转换成富文本
NSAttributedString *att = [[NSAttributedString alloc] initWithData:[model.detail dataUsingEncoding:NSUnicodeStringEncoding] options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType} documentAttributes:nil error:nil];
通过设置控件的字体大小来改变字的大小，位置要放在给控件赋值之后
6.计算文本高度
-(CGSize)sizeWithString:(NSString *)string font:(UIFont *)font
{
CGRect rect = [string boundingRectWithSize:CGSizeMake(kWidth-30,MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesFontLeading |NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: font} context:nil];
return rect.size;
}
7.获取点击cell的indexpath
//获取当前点击cell的row或者section
self.tableView.indexPathForSelectedRow.row
self.tableView.indexPathForSelectedRow.section
//获取当前点击cell的indexpath
self.mainView.indexPathsForSelectedRows
8.设置label不同位置字体大小和颜色
//设置不同字体颜色
-(void)setTextColor:(UILabel *)label FontNumber:(id)font AndRange:(NSRange)range AndColor:(UIColor *)vaColor
{
NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:label.text];
//设置字号
[str addAttribute:NSFontAttributeName value:font range:range];
//设置文字颜色
[str addAttribute:NSForegroundColorAttributeName value:vaColor range:range];
label.attributedText = str;
}
9.UITextView ：启动时文字位置不从顶部开始
- (void)viewDidLayoutSubviews {
[self.textView setContentOffset:CGPointZero animated:NO];
}
10.获取HTML字符串的文本信息
-(NSString *)filterHTML:(NSString *)html
{
NSScanner * scanner = [NSScanner scannerWithString:html];
NSString * text = nil;
while([scanner isAtEnd]==NO)
{
[scanner scanUpToString:@"<" intoString:nil];
[scanner scanUpToString:@">" intoString:&text];
html = [html stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%@>",text] withString:@""];
//去除空格
html = [html stringByReplacingOccurrencesOfString:@" " withString:@""];
}
return html;
}
11.隐藏导航栏返回按钮
隐藏
self.navigationItem.leftBarButtonItem.customView.hidden = YES;
显示
self.navigationItem.leftBarButtonItem.customView.hidden = NO;
12.QQ聊天背景图片拉伸方法
+ (UIImage *)resizeWithImage:(UIImage *)image{
CGFloat top = image.size.height/2.0;
CGFloat left = image.size.width/2.0;
CGFloat bottom = image.size.height/2.0;
CGFloat right = image.size.width/2.0;
return [image resizableImageWithCapInsets:UIEdgeInsetsMake(top, left, bottom, right)resizingMode:UIImageResizingModeStretch];
}
13.在控件内部取消键盘第一响应者
//在控件内部取消键盘第一响应者
[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];
14.获取cell在相对视图上的位置
NSIndexPath *index = [self.mainView indexPathForCell:cell];
CGRect rect = [self.mainView rectForRowAtIndexPath:index];
CGRect touchRct = [self.mainView convertRect:rect toView:self.view];
15.解决导航栏照片虚化放大
[self.rightBtn.widthAnchor constraintEqualToConstant:25].active = YES;
[self.rightBtn.heightAnchor constraintEqualToConstant:25].active = YES;
16.点击图片放大,再次点击缩小
/**
* @brief 点击图片放大,再次点击缩小
* @param avatarImageView 头像所在的imageView
*/
+(void)showImage:(UIImageView*)avatarImageView
{
UIImage *image =avatarImageView.image;
UIWindow *window =[UIApplication sharedApplication].keyWindow;
UIView *backgroundView =[[UIView alloc]initWithFrame:CGRectMake(0, 0, myWidth, myHeight)];
oldframe =[avatarImageView convertRect:avatarImageView.bounds toView:window];
backgroundView.backgroundColor =[UIColor blackColor];
backgroundView.alpha =0.5;
UIImageView *imageView =[[UIImageView alloc]initWithFrame:oldframe];
imageView.image =image;
imageView.tag =1;
[backgroundView addSubview:imageView];
[window addSubview:backgroundView];
//点击图片缩小的手势
UITapGestureRecognizer *tap =[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(hideImage:)];
[backgroundView addGestureRecognizer:tap];
[UIView animateWithDuration:0.3 animations:^{
imageView.frame =CGRectMake(0,([UIScreen mainScreen].bounds.size.height-image.size.height*[UIScreen mainScreen].bounds.size.width/image.size.width)/2, [UIScreen mainScreen].bounds.size.width, image.size.height*[UIScreen mainScreen].bounds.size.width/image.size.width);
backgroundView.alpha =1;
}];
}
+(void)hideImage:(UITapGestureRecognizer *)tap{
UIView *backgroundView =tap.view;
UIImageView *imageView =(UIImageView *)[tap.view viewWithTag:1];
[UIView animateWithDuration:0.3 animations:^{
imageView.frame =oldframe;
backgroundView.alpha =0;
} completion:^(BOOL finished) {
[backgroundView removeFromSuperview];
}];
}
17.判断字符串时候含有键盘表情
//判断字符串时候含有键盘表情
+ (BOOL)stringContainsEmoji:(NSString *)string
{
__block BOOL returnValue = 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) {
returnValue = YES;
}
}
} else if (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3) {
returnValue = YES;
}
} else {
if (0x2100 <= hs && hs <= 0x27ff) {
returnValue = YES;
} else if (0x2B05 <= hs && hs <= 0x2b07) {
returnValue = YES;
} else if (0x2934 <= hs && hs <= 0x2935) {
returnValue = YES;
} else if (0x3297 <= hs && hs <= 0x3299) {
returnValue = YES;
} else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
returnValue = YES;
}
}
}];
return returnValue;
}
//判断是否有emoji
-(BOOL)stringContainsEmoji
{
__block BOOL returnValue = NO;
[self enumerateSubstringsInRange:NSMakeRange(0, [self length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
const unichar high = [substring characterAtIndex: 0];
// Surrogate pair (U+1D000-1F9FF)
if (0xD800 <= high && high <= 0xDBFF) {
const unichar low = [substring characterAtIndex: 1];
const int codepoint = ((high - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000;
if (0x1D000 <= codepoint && codepoint <= 0x1F9FF){
returnValue = YES;
}
// Not surrogate pair (U+2100-27BF)
} else {
if (0x2100 <= high && high <= 0x27BF){
returnValue = YES;
}
}
}];
return returnValue;
}
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